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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,206
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I believe that the bulbs are rated at 6v, 2.4 watt headlamp if taillight used, taillight at 0.6 watts. But if no taillight, then 6v, 3 watt.
I know that I I did not answer your question, but I have no clue how much resistance you have in the circuit, if you have a higher wattage bulb then the voltage might not be very high. Look at your bulb(s) to see what they are rated at.
If you go fast down a hill you can blow out incandescent bulbs. I used to run zener diodes across it so that if voltage went above about 8 volts, the excess power would be drained off through the diodes.