Busch & Muller dynamo bicycle lights

Busch & Müller
(aka Busch & Mueller, B&M and BUMM)

Download the latest Busch & Müller catalog. 4mb PDF


Busch & Müller dynamo headlights are made to be powered by a 6 volt, 3 watt hub or sidewall dynamo. The use of Busch & Müller dynamo headlights powered by Velogical brand dynamos or other experimental generators risks damage to the headlight's electronics. Damage caused by overload through such generators is not covered by the one year warrantee!

New for 2018, IQ-XS

The new IQ-XS has similar styling to the IQ-X with a machined and anodized aluminum housing. Unlike the IQ-X the IQ-XS cannot be mounted upside-down.

Available in either black or silver anodized finishes. It has daytime running light, and automatically switches between daytime and nighttime modes. 70 lux.

Busch & Müller IQ-XS Silver, Part # B&M167RTSNDi, Price: $ 105.00

Busch & Müller IQ-XS Black, Part # B&M167RTSNDi-01, Price: $ 105.00

New for 2016, IQ-X

IQ-X headlight

This is the brightest dynamo powered bicycle headlight at 100 lux. The new optical system produces a smoother distribution of light on the road than any other headlight. The housing is anodized aluminum and acts as the heat sink for the LED.

IQ-X headlight

Available in either silver anodized or black anodized finish. The IQ-X has a standlight, as well as daytime running lights. Automatic switching between daytime and nighttime modes. The Senso/Off pushbutton switch is at the back of the IQ-X, surrounded by a glowing blue ring. The IQ-X always provides the ideal headlight beam; straight ahead in daylight so that oncoming car drivers are alerted to your presence, changing over at dusk to a beam optimized for illuminating the road surface ahead, but still providing high visibility to oncoming drivers.

The IQ-X ships with its own highly adjustable mount, and is compatible with other Busch & Müller headlight mounts. For most applications the included mount will work. See the exception below.


Front/Side view of the IQ-X in silver housing.

Note that the back or bottom section of the IQ-X mount, the part that presses against the fork crown, is about 32mm tall. By comparison, the "Cyo" mount, which ships with the Cyo and Luxos headlights, is about 20mm tall, as is the HD Caliper mount, pictured below.


This is the HD Caliper mount on my Rivendell Rambouillet. The spacer between the mount and the crown is 3mm thick. I'd need 6mm or 7mm of spacers to use the IQ-X mount on my frame. Some headsets are thicker than the Shimano Ultegra on my bike, requiring even more spacing.

The taller IQ-X mount will work on most modern forks. But older steel forks with cast crowns, in other words forks that have separate steel blades brazed into a cast crown, typically have the hole through the crown closer to the lower headset bearing than modern forks, and the IQ-X mount will require several mm of spacers behind it to clear the headset. So if you have an older style fork, like I do on my Rivendell bike, you probably want to use a different mount for the IQ-X.

If you have cantilever brakes, you can generally use the Cyo cantilever mount.

The IQ-X is the first dynamo headlight from Busch & Müller that is designed to be used upside-down if you like. The headlight itself still needs to be right-side-up, but the mounting band around the aluminum body itself can rotate around the headlight housing. This mounting band is available as a replacement part. See below.

upside down

Here I have loosened the torx bolts at the top of the mounting band, allowing the entire headlight housing to pivot around so that the mounting point is now at the top. Note that the wiring still comes out the bottom of the housing. The two short wires are for the taillight, and the 70cm long dual strand wire goes to the hub dynamo.

If you are a very silly person who won't be using a wired taillight, you must tape over or shrink wrap the connectors so as to prevent a short circuit. Nothing would be damaged, but the headlight won't work if there's a short. The headlight ships to you with all three wires routed through the body of the mount, and you can't actually see the taillight wires easily. Loosen up the bolts and then slide out the wires. The little section of heat shrink tubing (which hasn't been shrunk) will fall out. It's there to prevent a short if you never loosen that top torx bolt.


The IQ-X mount won't work with older cantilever brakes, so on my old bike I use a different mount that allows the cable to pass right through. This mount is rather long and tall, which puts the light higher above the tire, and so reduces the shadow from the tire. And when your front tire is 2.3" wide, that matters!

If you do this, you must make sure that the yoke is far enough below the mount that as the brake pads get thinner with wear, and the yoke moves further up during braking, the yoke never touches the mount. If the yoke contacts the mount, you'll lose braking force, and then you'll crash and die! Well, let's hope not. ;-) So, if every dozen rides or so you do a visual inspection of the yoke position while squeezing the brake lever, you'll know if it's time to change the brake pads or make other brake adjustments, such as shortening the yoke cable.

If my bike had wide profile cantilever brakes, the yoke could be positioned above this mount. But the brakes on this bike are low profile, at that requires a low yoke position.



This photo shows the beam of a prototype IQ-X. I'll have photos of the production version's beam as soon as possible.

I've now ridden with the IQ-X, and compared it with the Cyo Premium headlight. The beam is noticeably brighter at moderate speeds, it's also wider, and has better concentration of light at the top of the beam, making it a bit better for fast descents. It's a wonderful headlight. I can't say if the beam is noticeably brighter overall at high speeds, as I haven't yet been able to do a high speed comparison. But I can say that I don't think the major reason for choosing the IQ-X over the Cyo or Luxos B should be the higher lux rating, but rather the better distribution of light. I'll have more to say about this once I've spent more time riding with it.

Compatibility - Safety Issue!

We have recently discovered, (April 19, 2017) that the IQ-X headlight and the Busch & Müller USB-WERK charger are not compatible. When the cache battery in the USB-WERK is charging, the IQ-X beam becomes quite dim. While riding, this can happen for about two seconds, every thirty seconds or so, and so causes a dangerous situation, since the rider will briefly not be able to see the road ahead. If you have the USB-WERK and plan to use the IQ-X headlight, you should be prepared to unplug the USB-WERK at night. I recommend using the Lumotec IQ CYO Premium T Senso Plus or the new IQ-XS with the USB-WERK, since they are unaffected by this.

Some other headlights can also become dim when used with the USB-WERK, but only by very small amounts, so you would barely notice this while riding, so there is no safety concern.

Busch & Müller IQ-X, Silver, Part # B&M164RTSNDi, Price: $ 163.00

Busch & Müller IQ-X, Black, Part # B&M164RTSNDi-01, Price: $ 163.00

If you damage the mounting band, we sell replacements.

Busch & Müller mounting band for IQ-X headlight. Part # B&M464SCHELLE/PB, Price: $ 11.00

If you have the IQ-X and want to charge your mobile phone or GPS device while you ride, I recommend the E-WERK from Busch & Müller, or the Plug III from Tout Terrain.

New for 2014, Eyc, Cyo and Fly Headlights


The Lumotec Eyc, pronounced like "bike" (also like "like" for that matter) is very small and light; only 70 grams without the mount. The Lumotec T Senso Plus version with "Licht 24" daytime running lights, automatic switching and standlight. The switch has two positions, Senso and Off. When in Senso mode, the light automatically adjusts between Daytime Running Light mode in daylight, and the primary LED for road illumination at night. The Lumotec Eyc N Plus, a less expensive version with just the on/off switch and standlight but no daytime running lights is also available.


Yup, it's really small. The beam is almost as bright as the Cyo at 50 lux, compared with 60 lux for the Cyo. It's also a slightly narrower beam than the original Cyo headlight. In use, you probably wouldn't notice the difference in width, it's that small a difference. It's ideal for the urban commuter who primarily needs to see potholes and be seen by others. The IQ2 optics gives you good visibility at a distance, but also excellent near-field illumination of the road ahead. I photographed the beam October 27, 2013.

beam photo

I'm very impressed by this headlight. I've ridden with it and I like it a lot. For riding at moderate speeds, 15mph and below, it's as good as any other headlight I've ever seen. It's only at higher speeds during steep descents, and then only on roads that are otherwise unlit that this headlight falls short of other headlights costing much more, like the IQ Cyo Premium or IQ-X. Those more expensive headlights have wider beams at a distance and are a bit brighter at a distance. But for the urban commuter this headlight is gob-smackin' good.

To put this in perspective, only a few years ago, a bicycle headlight this good was unheard of. If I'd had them then, I could have sold truck loads at $300 each.

Eyc beam

This beam image was provided by Busch & Müller.

In my opinion, the "T" version is the one to get. Leave it on all the time and you'll have a nice daytime running light during the day, and the beam will automatically change to illuminate the road ahead when it gets dark, without blinding oncoming drivers. And, your taillight will be on as well, day and night.

Lumotec Eyc T Senso Plus, Part # B&M160RTSNDi-04, Price: $ 85.00

Lumotec Eyc N Plus, Part # B&M160RNDi-04, Price: $ 73.00

Eyc headlights ship without a taillight wire. We sell them separately.

Lumotec IQ Premium Cyo



The Lumotec IQ Cyo headlights have gotten an upgrade! The two new versions are called Lumotec IQ Premium Cyo, and have a even wider beam, about twice the width of the original CYO, improved near-field road illumination with a more even distribution of light from near to far on the road, and revised switches. I have ridden my bike with the new optics (a prototype) and I'm very impressed. On our narrow back roads here in Hillsborough, the original IQ optics didn't give me much light off to the side of the road. That never really bothered me as the illumination of the road itself was so good. But now that I'm riding with the new optics, I'd hate to go back.

I should say that when riding through the center of town, which has overhead street lights, there's no significant difference. But as soon as I get on those back roads, I feel more confident, particularly on fast descents. These headlights are amazing.

The IQ Premium beam is not quite as wide as the Luxos beam, and is perhaps not quite as good on a very fast descent, but it's awfully close, for a lot less money.

I'm stocking both versions of the IQ Premium CYO; the version with Daytime Running Lights (Licht 24), IQ Premium CYO T Senso Plus, and the less expensive version without Licht 24, IQ Premium CYO Senso Plus. Both versions have a 2 position switch. Off & Senso.

First I'll describe the "T" version. In Senso mode riding in daylight, the Daytime Running Lights are at full brightness. At dusk, the headlight will automatically switch over to nighttime mode and the Daytime LEDs will dim down so the road can be fully illuminated by the main LED which runs at full brightness. Or you may switch it off entirely.

The IQ Premium CYO Senso Plus can also be switched off entirely. Or, in Senso mode it will switch itself off during daylight and automatically switch itself on when it gets dark.


Busch & Müller Lumotec IQ Premium Cyo T Senso Plus, 80 lux, Part # B&M1752QTSNDi,
Price: $ 116.00 (Includes a taillight wire)

Busch & Müller Lumotec IQ Premium Cyo Senso Plus, 80 lux, Part # B&M1752QSNDi-04,
Price: $ 107.00 (Includes a taillight wire)

Note: Busch & Müller also makes the IQ Premium CYO RT Senso Plus for the German market. It has a reflector built into the front glass cover. The reflector is required by law in Germany. But no cop will ever haul you off to the slammer for having a front light but no reflector here in the US or Canada; and since the reflector makes the RT version a bit dimmer, I don't import that version.

Lumotec IQ Premium Fly RT Senso Plus


In my opinion, this is the best all around headlight for the daily commuter. I don't say this because the nighttime driving light is the best. It isn't. But it's so close that it's almost impossible to see the difference. However, the Daytime Runing Lights (Licht 24) in the IQ Premium Fly RT are better than any other dynamo headlight, including the new Luxos U, shown below. It's better because the six daytime LEDs, being spread over a large area, make for a very noticeable light during the day, increasing your visibility to oncoming drivers. The IQ Premium Fly RT's Licht 14 LEDs are spread over a larger area than the other Licht 24 headlights, and are therefore easier for oncoming drivers to see. We've all had the experience of an oncoming car driver turning left directly in front of us. Now, the driver won't be able to tell the judge he didn't see you. Of course, the whole system can be switched off if you like, but since the drag from dynamo powered lights is so low, why would you?

The daytime running light LEDs are dimmed at night when the primary LED is lit up at full intensity, illuminating the road surface ahead of you. The beam shape of the primary LED is the same as the beam in the Lumotec IQ Premium CYO headlight. The daytime LEDs remain lit at night just enough to help with reading roadside signs, and present a larger "footprint" of the headlight itself to oncoming drivers, but not bright enough to blind oncoming drivers. If the daytime running lights were as bright at night as they are in the daytime, they would tend to blind oncoming drivers.

Now with a two position switch; Off/Senso. In Senso mode riding in daylight, the Daytime Running Lights are at full brightness. At dusk, the headlight will automatically switch over to nighttime mode and the Daytime LEDs will dim down so the road can be fully illuminated.

Busch & Müller Lumotec IQ Premium Fly RT Senso Plus, 60 lux, Part # B&M1742QRTSNDi,
Price: $ 106.00
(Includes a taillight wire)

Fly Cantilever Mount, part number B&M474DUPB: $ 6.00

New for 2013, Luxos U

Luxos headlight

The Luxos U is in stock.

New for 2013, the Luxos U headlights have a new optical system, IQ2, which provides an even wider beam than the IQ system, and it's brighter too, at 70 lux. The Luxos U has a handlebar mounted switch incorporating a USB outlet for charging USB devices. It also has a cache battery for those devices that might switch off if the dynamo's voltage drops, like when standing at a stop light And, the Luxos U's beam automatically changes with the rider's speed, always producing the optimal beam pattern for that speed. The Luxos U is far and away the most advanced bicycle headlight available.

To see the amazing Luxos beam, please see my headlights page where you can compare the Luxos beam with the beams of most other dynamo headlight beams on the market today.


Photo above is of the original Luxos U.


Handlebar mounted button for controling functions of the Luxos U. It's where you can plug in your USB powered device for charging. This photo is of an older prototype. See the production version below.


Here the button has a USB cable plugged in.

Luxos U headlights also incorporate Busch & Müller's "Licht 24" daytime running lights, which help make daytime cycling in high traffic safer by helping oncoming drivers see you. The Luxos U includes a "Panorama" mode, in which power is shifted from the main LED to two side LEDs that illuminate the road close to the bike and to each side. The shift in power is done automatically below 15 kph, about 9 mph. The slower you go, the brighter the panorama LEDs glow, and power isn't wasted trying to illuminate the road far ahead while you're riding very slowly.

Luxos features
Lux (brightness of the beam at a standard distance) 70
Panorama light at close range Yes
90 lux Floodlight Yes
Handlebar Button Control Yes
USB Charging via Socket in Handlebar Button Control Yes
Cache Battery to Power Floodlight and Charging Other Devices Yes
Taillight Monitor (LED on headlight indicates if taillight is functioning) Yes
Licht 24 - Daytime Running Lights Yes
Automatic Sensor Switching Yes
Standlight Yes
Cable Conduit for mount Yes
Torx T20 fixing bolt for mount (includes T20 wrench) Yes

I don't usually gush over the products I sell, but the Luxos U headlights have some characteristics that to me are truly extraordinary, but impossible to describe in a few simple marketing phrases. So, please bear with me while I gush.

First, the beam is extremely wide; wider than any other dynamo powered bicycle headlight you can buy. You'll always have a great view of the road ahead of you, and you'll be able to see what might be coming onto the road surface from the sides. The Luxos could have been designed by Busch & Müller with a narrower beam, concentrating the light from the LED into a smaller area, and producing a headlight with an even higher LUX brightness rating. But then the Luxos beam wouldn't be as useful as it is.

Second, the vertical distribution of the available light, in other words, how the light is projected onto the road surface from close to the bike to out at a distance, is smoother than any other LED headlight I've seen. One issue with many other headlights is they can make the road surface close to the bike much brighter in comparison to the road at a distance. And that makes seeing the road at a distance more difficult, which is a serious problem when you're descending a hill at night. The further out you can see clearly, the more time you have to react to whatever you're approaching. I give a detailed explanation of this in this article. The only other dynamo headlight with similar near-to-far light distribution is the Schmidt E6, but it's a halogen headlight, has a very narrow and shorter beam, and isn't nearly as bright. In my opinion, the Luxos headlight produces a beam that will help you descend faster and more safely than with any other dynamo headlight. See the headlight beams page to see what I'm talking about.

Luxos Beam

This Luxos beam image is from Busch & Müller

Luxos headlights ship without a taillight wire. We sell them separately.

Luxos U, 70 lux, IQ2 Optics, Licht 24, USB charging (onboard AC to DC converter) Cache battery for charging, as well as powering the light to 90 lux for short periods, handlebar switch, monitors status of rear light, pictured mount included. Weight: 4 ounces without the included B&M475DPB mount. The Luxos U weighs a bit more due to the cache battery and AC to DC converter.

Part # B&M179U-04LSR, 54cm length wire to handlebar switch/USB port, for traditional bikes: $ 245.00

Please be aware, that the Luxos U is larger than most other dynamo headlights. So when you fold up your folding bike, there can be less space for the Luxos headlight than for whatever headlight had previously been on the bike. If the Luxos U headlight is pressed against another part of the bike when folded, that can put quite a lot of strain on the mount, causing it to fail. You must be sure that when folding or unfolding the bike that there is no stress placed on the Luxos U.

Luxos Wiring

The Luxos U ships with Busch & Müller's double strand wire to connect to the hub dynamo. They do not ship with a taillight wire. We sell Busch & Müller's double strand taillight wire, as well as a special heavy duty co-axial wire. The co-axial wire can be had with connectors only at the headlight end, or with connectors at both ends. Most Busch & Müller taillights can connect with either bare wire or 2.8mm connectors, and some connect only with the 2.8mm connectors.

Busch & Müller double strand wire, 185cm, connectors only at the headlight end, part #B&M424DKS-4-185: $
Busch & Müller double strand wire, 185cm, connectors at both ends, part #B&M424DKS-4-185: $

Schmidt Co-Axial 55cm wire to connect Luxos to SON dynamo hub, part # SCH55CM48-3: $ 9.00

Schmidt Co-Axial 55cm wire to connect Luxos to Shimano or Sanyo dynamo hub, part # SCH55CMB-3: $ 9.00

Schmidt Co-Axial 190cm wire to connect Luxos to taillight, connectors at both ends, part # SCH72080: $ 12.00

Schmidt Co-Axial 190cm wire to connect Luxos to taillight, connectors at one end, part # SCH72081: $ 12.00

If you need a custom length, we can make it for you. Send us the specs and we'll quote a price.

About the Luxos U

The Luxos U has some extraordinary features. You may use the handlebar button to switch between various modes of operation. For example, the Flood Light mode at night uses the cache battery charge to provide full output from all of the LEDS for as long as the cache battery charge lasts. In daytime, with the light switched "off", you can flash a motorist ahead with a quick press of the handlebar mounted button. (Note: This is not a continuous flashing mode, as I originally thought. Sorry for any confusion.) The handlebar button also provides the USB connection for your phone or GPS. The charge status of the cache battery is indicated by an LED on the button.

The Luxos U is both a headlight and a charger for cell phones. But it can't do both simultaneously as 6 volt hub dynamos don't produce enough power for both functions. So, either run the headlight, or charge your phone. Don't try to do both.

The Luxos headlights can be used mounted at the fork crown on forks with a low profile cantilever brakes using the CYO cantilever mount. However, the low position of the light relative to the tire and fender will result in a larger shadow cast in front of the bike. There is no ideal mount for this application, though most folks should be satisfied with the overall performance of the Luxos mounted this way.

The included mount works on most bikes with caliper brakes, V brakes and disc brakes. The Luxos headlights can also be mounted on most handlebars. I stock handlebar mounts for standard and oversized handlebars.

See comparison photos of most dynamo headlights including the Luxos U on this page.

Download the English language instruction manual for the Luxos U headlights here. 300kb PDF


The Luxos U is not compatible with all taillights. Any taillight that grounds to the frame via its mounting bolt(s) is incompatible with the Luxos U.

Busch & Müller makes several taillights which do not make a ground connection via the mounting bolts. So these are fully compatible with the Luxos U.

Rear Rack Mounting

Toplight Line Plus, Part # B&M323ALT, Price: $ 44.00
Toplight Line Plus Brake Tec (pulsating), Part # B&M323ALTV-A, Price: $ 61.00
Toplight Line Plus Brake Tec (pulsating) for Tout Terrain frames, Part # B&M3235ALTV0261-A, Price: $ 61.00
Toplight Mini Plus, Part # B&M322ALK, Price: $ 33.00
Toplight Flat S Plus, Part # B&M329ASK-02, Price: $ 23.00
Toplight View Plus, Part # B&M321ASK-02, Price: $ 26.00
Toplight View Brake Plus # B&M321ASKV-02, Price: $ 46.00

(1) First, a few of the original version of the Busch & Müller Toplight Line Plus BrakeTec are not compatible with the Luxos U. Actually, many of these taillights will work just fine, but a few won't, due to slight variations in the tolerances of one electronic component in the taillight. Given the complex nature of that taillight as well as the Luxos U, there is sometimes a problem, and the two lights ought not be used together without first being tested during daylight hours. The new "pulsating" version of the BrakeTec works fine with the Luxos U.


Even with a compatible taillight, you must be careful to maintain the correct polarity between the Luxos U headlight and the taillight. As of this writing, Sept 2014, there are four taillights that will not function properly if you reverse the polarity between the headlight and taillight. These are the Toplight Line and Toplight View taillights, and the Toplight Line Brake Tec and Toplight View Brake Tec taillights. If you should reverse the polarity, the standlights will not work, and in some cases the taillight will not work at all!

So, + on the headlight must be connected to + on the taillight, and - on the headlight must be connected to - on the taillight. This is critical!

Fender and Frame Mounting

For fender mounting, the only taillights I recommend with the Luxos U are the Secula and the (Micro).

Secula for fender mounting, Part # B&M331ALK-02, Price: $ 33.00

The Secula is also made for mounting on a seatpost or seatstay.

Secula for seatpost/seatstay mounting, Part # B&M331/2ASK, Price: $ 37.00

The (Micro) includes mounts for mounting on a seatpost, seatstay or fender.

(Micro) for seatpost/seatstay/fender mounting, silver, Part # B&M332ALK, Price: $ 68.00

(Micro) for seatpost/seatstay/fender mounting, black, Part # B&M332ALK-01, Price: $ 68.00

Don't use these taillights with a Luxos U

Rack Mounted: DToplight Plus, DToplight XS Plus, DToplight XS, 4DToplight Senso Multi

Fender Mounted: 4DLite Plus, Seculite Plus, Seculite

Any Schmidt or Supernova taillight!

Wiring the Luxos

At the bottom rear of both Luxos headlights are four 2.8mm connectors. Two are labeled "in" and two are labeled "out". You must connect the wire from the hub dynamo to the two connectors labeled "in". If you connect the hub dynamo to the "out" conectors, the headlight will not function properly.

If you choose not to use a wired taillight, it's no problem. Just connect nothing to the "out" connectors.

And, since the little male connectors are permanently emdedded in the rear of the Luxos housing, it can be a bit awkward to install the wires after the headlight is mounted on the fork. I recommend connecting the hub and taillight wires to the Luxos before mounting the Luxos on the fork crown. Take care when attaching the connectors. If the fit is too tight, loosen the female connectors a bit so they slide on without damaging the embedded male connectors in the Luxos housing. Broken connectors are not covered by the warrantee!

These are the connectors at the bottom rear of the Luxos U. We have a solution for easily connecting the wires to these connections.

Since about November, 2015 we have attached what we call "pigtails" to the male connections on the Luxos U before we sell them. These give the user 2.8mm male connections about 10cm (4 inches) from the headlight housing, making attaching the taillight wires and input wires much easier. Please do not disconnect these wires from the Luxos U. If you don't plan to use a wired taillight, just wrap the ends of the output connectors with electrical tape or shrink tubing so that you don't create a short circuit. Don't cut them off because most people eventually decide that having a dynamo powered taillight is a very good idea.

What a Luxos U Doesn't Do

We get a lot of questions about the Luxos U. Some people want to charge their car battery. Perhaps they envision strapping the car's battery on a rear rack, pedal around the block a few times, and then they'll be able to start the car? As Mr. Spock might say, "Interesting."

The Luxos U won't charge a car battery, or an iPad, though it will charge an iPhone or a Garmin GPS. The larger battery in the iPad needs too much current; more than any hub dynamo can provide. If you need to charge an iPad on the road, you'll need to find another solution. Note that this isn't due to any shortcoming of the Luxos U, but rather it's because hub dynamos just don't have enough power output.

If you need to charge your car's battery, get a suitable charger at your hardware store. And have your alternator checked out by a competent mechanic. ;-)

Lumotec Avy


This new headlight replaces the Lumotec LYT. It has better optics, similar in design to the CYO and Eyc. It's smaller and less expensive than the Lumotec Lyt, so I am no longer stocking the Lumotec Lyt. Good side illumination for added safety. 30 lux


Two versions. "N Plus" with On/Off switch and standlight. And T Senso Plus with Daytime running lights (Licht 24) and automatic switching between daytime beam and nighttime beam. Mount included, as shown.

B&M Lumotec Avy T Senso Plus, Part # B&M162RTSNDi-04, Price: $ 65.00

B&M Lumotec Avy N Plus, Part # B&M162RNDi-04, Price: $ 50.00

beam image


The new for 2018 Upp headlight provides a 30 lux beam with excellent near-field illumination ideal for the urban commuter. The included mount works with any unicrown fork with either disc brakes or v brakes. Available in two versions. The Upp T Senso Plus will automatically switch from a daytime beam to a nighttime beam as ambiant light levels rise or fall. The less expensive Upp N Plus is manually operated; either on with a nighttime beam or off.

Busch & Müller Upp T Senso Plus, Part Number B&M166TSNDi, Price: $ 46.00

Busch & Müller Upp N Plus, Part Number B&M166NDi, Price: $ 36.00

Lumotec Classic


New for 2012, the Lumotec Classic is styled much like the dynamo headlights of the 1950s. But the internals are all modern, using the LED, optical system and electronics of the Lumotec Lyt headlights. As with the other B&M headlights, it's available in two versions. All have Standlight technology. The LED remains lit, at a lower intensity for several minutes after you stop, say at a traffic light. I also stock a version with "Licht 24", Daytime Running Lights.

headlight switch

Here you see the top mounted switch. This is the switch label used on the daytime running light version. The "N" version has different labeling, but the same switch. Both versions ship with a fork crown mount that's suitable for caliper brakes, disc brakes or V brakes. If you have cantilever brakes, you can use the same cantilever mount as the Lumotec Fly and Lumotec IQ Fly.

The Lumotec Classic headlights can be used with or without a 6 volt wired taillight.

25 LUX

B&M Lumotec Classic N Plus has a 2 position On/Off switch, and of course, a standlight.
Lumotec Classic N Plus, part # B&M1786CNDi: $ 65.00

B&M Lumotec Classic T Senso Plus has a 3 position switch, On/Off/Senso; "Licht 24" Daytime Running Lights, and a standlight.
Lumotec Classic T Senso Plus, part # B&M1786CTSNDi: $ 78.00

B&M Fly Cantilever Mount, part # B&M474DUPB: $ 6.00


This beam image provided by Busch & Müller.

Lyt Basic N Plus

This headlight produces 20 lux and has the same shape of beam as the Classic.

B&M Lumotec LYT Basic N Plus, Part # B&M B&M1781NDi, Price: $ 37.00

Onefive T Senso Plus


This new headlight, as of 2016, is made exclusively for 1.5 watt dynamo hubs. It must not be used with 2.4 watt or 3 watt dynamos, as those higher power dynamos will damage the Onefive. But if you have been sold one of these low power hubs, the Onefive T Senso Plus will provide a brighter beam than a headlight designed for a 3 watt hub.

As of March, 2016, the only 1.5 watt hub I know of is the Shimano DH-S701.

Busch & Müller Onefive T Senso Plus, Part # B&M165RTSNDi, Price: $ 65.00

Unswitched Headlights

The headlights for tire driven dynamos like the Busch & Müller Dymotec 6, Dymotec S12 and others do not require a switch since the system is turned on by moving the dynamo into contact with the tire. By the way, it's that movement that determines whether a sidewall dynamo is right sided or left sided. So the more expensive switched headlights that I sell for hub dynamos are not needed. I stock all of the 6 volt halogen and LED headlights that Busch & Müller makes for use with the Dymotec 6 and (discontinued S6) generators, or any 6 volt tire driven generator. I stock a 12 volt headlight and a 12 volt rack mounted taillight for use with the Dymotec S12. I also stock spare 5 watt bulbs for the headlight.

All of the headlights I sell have circuitry to protect the bulb from burn-out at high speeds. All 6 volt halogen headlights ship to me with a 2.4 watt bulb installed, and are intended to be used with a .6 watt taillight. A 3 watt bulb is optional for the 6 volt headlights when used without a taillight. The 12 volt headlight ships with a 5 watt bulb. 5 watt bulbs cannot be used in a 6 volt headlight. 2.4 or 3 watt bulbs cannot be used in a 12 volt headlight. All current LED headlights can be used with or without a taillight attached.

It's important to remember that Busch & Müller uses the same housings for headlights intended for tire driven dynamos as they use for headlights intended for hub dynamos. So, when you receive a headlight for use with your Dymotec 6 sidewall dynamo, it may well have a switch, but the switch has no function. Some headlights for hub dynamos have extra LEDs for daytime running lights. So you may see where these LEDs are missing. But this is OK as headlights for tire driven dynamos don't have daytime running lights.

Busch & Müller Lumotec Eyc Plus


This photo is of the hub dynamo version. The Eyc Plus looks identical. Only visual difference is the name on the side. And, if you will always ride with the headlight on, you can save money buying this unswitched version.

This is by far the best headlight available for the Dymotec 6 dynamo. See the photo of the beam.


Notice how evenly the road is illuminated, from just a couple of feet ahead of the bike out to about 150 feet ahead. Only a few years ago, there were no bicycle headlights at any price with a beam this bright, this wide, and this even.

Busch & Müller Lumotec Eyc Plus, Part # B&M160RDi, Price $ 68.00

If you have a 6 volt sidewall dynamo lighting system on your bike, and you're thinking that you have to upgrade to a hub dynamo to get a better headlight beam, you're mistaken.

The Eyc Plus is not compatible with the older and now discontinued Dymotec S6 dynamo. But it is fully compatible with the Dymotec 6 dynamo.

Busch & Müller Lumotec Oval Plus 12

Lumotec Plus


Busch & Müller Lumotec Oval Plus 12 (12 volt, 5 watt) headlight and brackets for use only with, now discontinued, Dymotec S12 generators. Comes with single strand 185cm wire and connectors. Comes with a 5 watt bulb. Available now: $ 88.00

A reflector is above the lens for added safety.

The bracket shown will mount the light directly over the front tire using the hole in the center of the fork crown on bikes with cantilever brakes or v-brakes. Also included with the Oval headlight is a bracket for mounting on bikes with caliper brakes. These brackets are also sold separately.

Replacement Halogen Bulbs

All Busch & Müller halogen headlights use HS3 drop in style bulbs, made by either Osram or Phillips. Almost all of the headlights I sell these days use LEDs. These bulbs are only for use with older halogen bulb headlights.


They don't screw in, they drop in. Notice the flange around the center of the bulb. See the notch in the flange? That notch fits around a ridge in the bulb mounting position of the headlight. The filament is positioned relative to the notch. So the notch is forcing the filament to be aligned very precisely and that is critical in focusing the beam correctly.

That's why Busch & Müller uses these bulbs rather than bulbs that screw in.

These bulbs are available in two versions; one version is for use when the headlight is being used along with a wired taillight. The taillight consumes .6 watts. The total draw on the dynamo needs to be 3 watts. So with a .6 watt taillight, you use a 2.4 watt bulb.

If you can't use a wired taillight for some reason, you would then use a 3 watt bulb in the headlight. If you use a 2.4 watt bulb in the headlight when you don't have a taillight connected, the bulb can burn out quickly.

6 volt, 2.4 watt halogen bulb: $ 4.00

6 volt, 3 watt halogen bulb: $ 5.00

These 6 volt bulbs work in all Busch & Müller 6 volt halogen headlights. They also work in the Schmidt E6 as well as the old BiSy headlight.

12 volt, 5 watt halogen bulb: $ 16.50 (The 5 watt bulb can only be used in the 12 volt Lumotec Oval Plus 12 headlight.)

I don't sell other types of bulbs for dynamo headlights. I only sell bulbs for the headlights I sell. If you have a dynamo headlight with a screw in bulb, my best advice is to replace it with a Busch & Müller headlight. The beam will be much better.

I do not sell bulbs for taillights. Since LEDs work so much better in a taillight than bulbs, I recommend that anyone with a bulb type taillight upgrade to an LED type. See here for dynamo powered taillights.

Mounting Headlights

All Busch & Müller dynamo powered headlights are designed to be used in all weather. Your bike can sit out all day in the rain, and it can be raining hard while you ride, but it won't effect the proper functioning of the headlight, provided that the headlight is not being sprayed with water. Huh? I'll explain.

For example, if you mount the headlight at the crown of the fork using a Busch & Müller mount, the light will be high enough above the front tire that water won't spray up from the tire and hit the light. And of course any suitable commuting or brevet bike will have fenders. But some bikes are now being made by custom frame builders with special front racks which have headlight mounts towards the front of the rack. In some cases, the headlight is right in the path of water being sprayed towards the front. Busch & Müller dynamo headlights all have openings at the bottom to allow any water that gets inside to drain out. But water spraying off a tire can enter via those openings. So you must position the light where it won't be subjected to this type of spray. If you must position the light well forward of the front tire you must also place a barrier of some sort to deflect water away from the headlight.

If you can't mount the headlight at the fork crown because you have a bag in the way, you can often mount the headlight at the side of the fork, just below the tire. Along the fork blade, the headlight will only get water from above, which won't cause any trouble. See my mounting page for more info.

Where to Buy?

Call us at 603 478 0900 to order directly from Peter White Cycles.

See this page for a list of local bicycle shops that generally stock our products, or can order them for you.

See this page about ordering from us.

Dealer Inquiries Invited. Please call 603 478 0900

If you have a retail bicycle shop, or are a bicycle manufacturer, you can purchase Busch & Müller products, including dynamos, headlights, taillights, battery lights and mirrors at wholesale prices for resale. Any shop in the US or Canada can purchase Busch & Müller products for sale in your store. Please call me for pricing. Peter White Cycles is an official representative for Busch & Müller in the US and Canada, and we want all bicycle shops to be able to sell these products.

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This page updated: Wednesday, November 7, 2018

Peter White Cycles LLC
24 Hall Rd.
Hillsborough, NH 03244
603 478 0900 Phone
603 478 0902 Phax