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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!

But more importantly, damage is most likely to occur while riding fast, descending a hill. That can cause your headlight to fail, potentially leading to a crash and injury to the rider. With a proper dynamo hub, such a failure is virtually impossible. For your own safety, please do not use any lights made by Busch & Muller with a Velogical dynamo.

Busch & Müller makes a wide variety of bicycle headlights for use with hub dynamos as well as tire driven dynamos. If used with a 6 volt 3 watt dynamo these lights work along with a taillight and deliver their maximum brightness. If used with a 6 volt 2.4 watt dynamo they deliver their maximum brightness without a taillight.

When used with a taillight, the taillight is wired to the taillight connectors on the headlight. So power goes from the dynamo to the headlight and then from the headlight to the taillight. The On/Off switch on the headlight then controls both the headlight and the taillight. The headlight also provides the correct voltage to the taillight eliminating the risk of damage to the taillight.

From the top of this page to the bottom, headlights are listed starting with the brightest. Brightness of these headlights is rated in LUX.

To order, just call us at (603) 478 0900

     
     
IQ-X 100 Lux
     
     

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As of 2020, this is the brightest dynamo powered bicycle headlight at 100 lux. The optical system produces a very smooth distribution of light on the road. The housing is anodized aluminum and acts as the heat sink for the LED.

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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.

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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. It's been designed for "unicrown" forks, which are rather 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.

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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, with the wires coming off the bottom, 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.

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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.

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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, and that requires a low yoke position.

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.

     
B&M164RTSNDi-01 Busch & Müller IQ-X, Black $175.00
B&M164RTSNDi Busch & Müller IQ-X, Silver $175.00
     
B&M464SCHELLE/PB Busch & Müller mounting band for IQ-X headlight. $12.00
     
B&M464HSPB B&M IQ-X mount black $19.00
B&M464HPB B&M IQ-X mount silver $19.00
     
   
     
IQ-XL 300 Lux
     

Coming, fall, 2024. This extremely bright headlight is, believe it or not, powered by a 6 volt, 3 watt hub dynamo, just like all of the other headlights on this page. In low beam, the headlight is rated at 300 lux, the brightest dynamo powered headlight ever! That's three times as bright as the IQ-X. There's a handlebar mounted switch to change to a high beam. At high beam the brightness rating drops to a mere 250 lux. ;-)

If you are an urban commuter, and if you laugh at the rain, you'll know that when riding in the rain with traffic at night you never have a bright enough headlight. But with the IQ-XL you'll have the best headlight available, and a better view of the pothole strewn road ahead than with any other dynamo headlight. The beam is not only extremely bright, but also extremely wide.

     

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The headlight ships with a fork crown mount, as you can see above. You can also use a handlebar mount as pictured below if you prefer. Handlebar mounts are sold separately.

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As I write this page in August, 2024, the dollar to euro exchange rate is 1.08 dollars to one euro. We are expecting these headlights to arrive late in November or December, 2024. If the exchange rate changes significantly, the price you see here will also change.

To reserve one of these beauties, a deposit of $100 will hold one for you once they arrive. In the unlikely event we have to raise the price due a change in the exchange rate, you can get a full refund of your deposit.

     
B&M169U11/55TSDI-01 B&M IQ-XL Highbeam $330.00
     
IQ CYO 80 Lux
     

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At 80 lux, the IQ Cyo Premium is Busch & Müller's next brightest headlight. If you want a very bright headlight, this is the best value for the money. Above, the IQ Cyo Premium Senso Plus switches itself on or off as ambient light levels change. So it's off during the day, and on at night.

The manual rotary switch is at the back of the Cyo.

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Available in two versions; with or without daytime running lights. The IQ Cyo Premium Senso Plus switches itself between Daytime Running Light mode during daylight, and the nighttime beam when it gets dark, so you always have the optimal beam. If you are on tour and charging a mobile phone during the day, the T Senso Plus can also be switched off manually.

The rotary switch is at the back of the Cyo.

     
The IQ Cyp Premium headlights are Busch & Müller's best values in a bright headlight for cycling at night, particularly in the rain when it seems like you never really have enough light.
     
B&M1752QSNDi-04 Busch & Müller Lumotec IQ Premium Cyo Senso Plus, 80 lux $100.00
     
B&M1752QTSNDi Busch & Müller Lumotec IQ Premium Cyo T Senso Plus, 80 lux $110.00
     
If your bike has cantilever brakes, the standard mount for the Cyo headlights won't work. You need a mount that will pass under the yoke.
B&M475DUPB Busch & Müller Cyo cantilever mount $10.00
     
     
IQ-XS 80 Lux
     

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B&M167RTSNDI Busch & Müller IQ-XS Silver $110.00
     
B&M167RTSNDI-01 Busch & Müller IQ-XS Black $110.00
     
If your bike has cantilever brakes, the standard mount for the IQ-XS headlights won't work. You need a mount that will pass under the yoke.
B&M475DUPB Busch & Müller Cyo cantilever mount $10.00
     
     
IQ-XS Friendly 80 lux
     

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This new headlight is rated at 80 lux, just like the Cyo. The housing is made of a new biodegradable plastic. Good side illumination for added safety. 80 lux

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B&M516711GRTSNDi-04 B&M Lumotec IQ-XS Friendly, 80 lux $75.00
     
If your bike has cantilever brakes, the standard mount for the IQ-XS Friendly headlights won't work. You need a mount that will pass under the yoke. The Cyo mount is perfect.
B&M475DUPB Busch & Müller Cyo cantilever mount $7.00
     
     
IQ Premium Fly RT Senso Plus
     

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In my opinion, this is the best all around headlight for the daily urban commuter. I don't say this because the nighttime driving light is the best. It isn't. But it's close enough that it's difficult to see the difference. However, the Daytime Runing Lights (Licht 24) in the IQ Premium Fly RT are better than any other dynamo headlight. 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. 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 credibly 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.

     
B&M1742QRTSNDI Busch & Müller Lumotec IQ Premium Fly RT Senso Plus, 60 lux $85.00
     
If your bike has cantilever brakes, the standard mount for the IQ Fly headlights won't work. You need a mount that will pass under the yoke.
B&M474DUPB Busch & Müller Fly cantilever mount $7.00
     
   
Lumotec Briq-S

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The new Briq-S has a wide 60 lux projected beam, daytime running lights, with standlight and On/Off switch.
   
   
B&M153RTSNDI-04 Busch & Müller Briq-T Senso Plus $50.00
     
     
Myc 50 lux
     

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This new headlight is rated at 50 lux. Good side illumination for added safety. See the beam projected below. 50 lux

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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.

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B&M150RTSNDI-04 B&M Lumotec Myc T Senso Plus, 50 lux $45.00
B&M150RNDI-04 B&M Lumotec Myc N Plus, 50 lux $40.00
     
If your bike has cantilever brakes, the standard mount for the Myc headlights won't work. You need a mount that will pass under the yoke. The Cyo mount is perfect.
B&M475DUPB Busch & Müller Cyo cantilever mount $7.00
     
     
Lumotec Avy, 40 Lux
     

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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

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T Senso Plus with Daytime running lights (Licht 24) and automatic switching between daytime beam and nighttime beam. Mount included, as shown.

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B&M162RTSNDI-04 B&M Lumotec Avy T Senso Plus, 40 lux $32.00
     
If your bike has cantilever brakes, the standard mount for the Avy headlights won't work. You need a mount that will pass under the yoke. The Cyo cantilever mount is perfect.
B&M475DUPB Busch & Müller Cyo cantilever mount $7.00
     
     
Lumotec Dopp, 35 Lux
     

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This new headlight is basically and improvement on the well regarded Upp design, with better optics and higher lux rating. Good side illumination for added safety. 35 lux

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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&M151RTSNDi-04 B&M Lumotec Dopp T Senso Plus, 35 lux $24.00
B&M151RNDi-04 B&M Lumotec Dopp N Plus, 35 lux $20.00
     
If your bike has cantilever brakes, the standard mount for the Dopp headlights won't work. You need a mount that will pass under the yoke. The Cyo mount is perfect.
     
B&M475DUPB Busch & Müller Cyo cantilever mount $7.00
     
     
Upp
     

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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. 30 lux

     
B&M166TSNDi Busch & Müller Upp T Senso Plus, 30 lux $18.00
B&M166NDi Busch & Müller Upp N Plus, 30 lux $15.00
     
If your bike has cantilever brakes, the standard mount for the Upp headlights won't work. You need a mount that will pass under the yoke. The Fly mount is perfect.
     
B&M474DUPB Busch & Müller Fly cantilever mount $7.00
     
     
Lumotec Classic
     

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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.

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B&M1786CTSNDI Lumotec Classic T Senso Plus $86.00
B&M1786CNDI Lumotec Classic N Plus $
     
If your bike has cantilever brakes, the standard mount for the Classic headlights won't work. You need a mount that will pass under the yoke. The Fly mount is perfect.
     
B&M474DUPB Busch & Müller Fly cantilever mount $7.00
     
     
Lyt Basic N Plus
     

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

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B&M1781NDi B&M Lumotec LYT Basic N Plus, 20 lux $16.00
     
If your bike has cantilever brakes, the standard mount for the Lyt headlights won't work. You need a mount that will pass under the yoke. The Cyo mount is perfect.
     
B&M475DUPB Busch & Müller Cyo cantilever mount $7.00
     
     
Onefive T Senso Plus
     

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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.

     
B&M165RTSNDi Busch & Müller Onefive T Senso Plus $20.00
Replacement Halogen Bulbs
     

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I no longer sell headlights with halogen bulbs. I only sell headlights with LEDs. But I used to sell headlights with halogen bulbs. So as long as I can get them, I'll be selling replacement halogen bulbs for those older headlights.

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 three versions; two for 6 volt systems, and one for their 12 volt system, powered by the Dymotec S12 sidewall dynamo. The 2.4 watt bulb is for use with a 6 volt dynamo 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.

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. I don't know if they are compatible with other brands of headlights.

The 5 watt bulb can only be used in the 12 volt Lumotec Oval Plus 12 headlight.

Don't mix and match between 6 volt components and 12 volt components.

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.

     
LUMBB2.4 6 volt, 2.4 watt halogen bulb $4.00
LUMBB3W6V 6 volt, 3 watt halogen bulb $5.00
B&MB5 12 volt, 5 watt halogen bulb $16.50

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This page updated: Monday, May 20, 2019

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