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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,213
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 am pretty sure that the UPS truck had standard 7 inch round headlamp. In USA those were usually a sealed beam decades ago, other countries often allowed a better quartz halogen headlamp with replaceable bulbs. Motorcycles also could run the quartz halogen 7 inch lamps with replaceable bulbs instead of sealed beams. I used a good quartz halogen headlamp on my vintage motorcycles, I think the ones I bought were Hella brand. Wattage was 55 watt low beam, 65 watt high beam, Bulb had two filaments, only one filament was used at a time, either high or low but not both.
The exercise bike at the gym and also the stair master suggest that I can produce about 120 to 140 watts on a continuous basis, which is a bit over double what one of those lamps would draw. Do you still want to try to power two of those lamps with pedal power?