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Bottle Dynamo / Schmidt E6?

Old 09-20-17, 07:49 PM
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Bottle Dynamo / Schmidt E6?

Does anyone know if a bottle dynamo will drive a Schmidt E6 halogen light?

I removed the ancient yellowed generator headlight on the daughter's UO-8 college bike. It worked but the beam pattern looked like an artistic starburst. I installed a E6. Now I have a faintly flickering light, far less effective than the old light.

What gives?
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Old 09-20-17, 08:29 PM
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I had Peter White help me with my B&M bottle, front, and rear lights. If his website won't get you what you want, you can call e-mail him. He was helpful to me.
Schmidt Headlights
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Old 09-21-17, 01:10 AM
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Check the wattage on the dynamo. Modern headlights only need 1.5-3W of power whereas the old incandescent bulbs needed 6W. The Schmidt headlight probably falls into the latter category.

You could try finding an old-school dynamo on Craigslist/eBay or do what I did;
Mod a modern headlight to fit a classic headlight.

Aldo: Check the wiring instructions.
Did you connect a rear light?

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Old 09-21-17, 05:00 AM
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Originally Posted by jyl
Does anyone know if a bottle dynamo will drive a Schmidt E6 halogen light?
Well, there are bottle generators and bottle generators, if you take my meanin'. And that E6 is a halogen light, not a modern LED.

Some experience: I have an old "Schwinn Approved" BG by Union, an old French unit which I think is by Cibie, and a Shutter Precision SV-8 hub generator. The Union, though decades old, seems to meet stringent German standards on output vs. speed. The Cibie has lower output but drives an LED just fine. The SV-8 is spec'ed for the higher rotation speed of road bikes or smaller wheels.

Now, a long time ago I tried the Union on a German halogen light which may have been Schmidt or perhaps Hella. (Did Hella make bike lights? I don't recall.) It worked just fine but I didn't like the beam pattern. The Union's output was so good at low speed you could look at it funny and LED lights would come on. It did require more than walking speed for the halogen, but then so do the SV-8 and Cibie with LEDs. I never tried the halogen with another generator but I suspect it would not work as well.
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Old 09-21-17, 05:28 AM
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Originally Posted by JaccoW
Check the wattage on the dynamo. Modern headlights only need 1.5-3W of power whereas the old incandescent bulbs needed 6W. The Schmidt headlight probably falls into the latter category.
There were two bulbs available for the E6: one that wanted 6V3W for use w/o a tail light, and one with 6V2.somethingW for use when you were running a generator powered tail light.
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Old 09-21-17, 06:19 AM
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Originally Posted by palincss
There were two bulbs available for the E6: one that wanted 6V3W for use w/o a tail light, and one with 6V2.somethingW for use when you were running a generator powered tail light.
This might be part if the riddle. If the bulb is meant for higher power output then it won't be as bright.
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Old 09-21-17, 06:44 AM
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Originally Posted by JaccoW
Check the wattage on the dynamo. Modern headlights only need 1.5-3W of power whereas the old incandescent bulbs needed 6W. The Schmidt headlight probably falls into the latter category.
No, that's not true at all. A standard bottle dynamo puts out half an amp and hangs around 6V in most conditions, giving 3W of power. Your normal front bulb is then 2.4W, with a 0.6W rear.

There are 12V 6W dynamo sets which are quite interesting, because the headlight has switchable high/low beams like a car. But these are exceptionally rare.
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Old 09-21-17, 02:10 PM
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And given the performance of modern LED headlights, those 12v dynamos are no longer necessary.
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Old 09-21-17, 03:07 PM
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Originally Posted by jyl
Does anyone know if a bottle dynamo will drive a Schmidt E6 halogen light?

I removed the ancient yellowed generator headlight on the daughter's UO-8 college bike. It worked but the beam pattern looked like an artistic starburst. I installed a E6. Now I have a faintly flickering light, far less effective than the old light.

What gives?
any chance that you can provide pics of the bottle dynamo, along with wiring, etc.?

Offhand, there hasn't been any change to the standard output of dynamos. With a standard 12 ohm bulb, the output is 6VAC at 0.5A. This provides 3 watts of power, which is typically split to deliver 2.4W to the headlight and 0.6W to the taillight. This does require, though, that the proper bulbs are in each light.

Obviously, it also requires that the wiring all be connected and installed correctly. It's not uncommon for one terminal of the dynamo to be connected to the bicycle frame, and it's also not uncommon for the headlight to have a terminal connected to the bike frame. If the user happens to connect the ungrounded dynamo output to the headlight's grounded terminal, then the light won't work. If the connections to the frame are not good connections. then it's possible that the dynamo won't be completely shorted out, and some power may get to the bulb.

In summary.... there's lots of ways to mess things up, and those of us sitting at a computer/phone won't be much help without more info.

Steve in Peoria
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Old 09-21-17, 04:54 PM
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Unless you already own the light, why not just buy a new B&M or Schmidt or any LED light? Or try it and if it doesn't work, buy an LED light.
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Old 09-21-17, 05:56 PM
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Originally Posted by palincss
And given the performance of modern LED headlights, those 12v dynamos are no longer necessary.
Don't be so sure. I think they could be excellent candidates for LED conversion because of the low beam switch ability. 5.5W of LED light would be incredible. It could be a very good project for people who could fabricate a bulb housing to put the LED in.

I've done similar with 6V dynamo headlights, but then you end up having to make a hood to stop it blinding everyone going the other way.

Last edited by Cute Boy Horse; 09-21-17 at 05:59 PM.
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