Light power vs Speed. I once had a PAR36 100 watt 6 volt bulb I got from an aircraft supply store. Lance Armstrong coldn't outrun it on a steep downhill. I had to keep moving on warm nights or the rubber tractor headlight mount that held it would start to melt. I powered it with 3 Gates(Hawker now) BC cells, heavy.
Now I use a 30 watt bulb that is still stronger than I need for my speed mated with a 12 volt battery from
Toys-R-Us. Low wattage bulbs might equal whatever speed you want if they have a tight focus. Downsides are they may not show hazards outside the narrow central focus. I go for higher power for safety reasons. I want other vehicle operators (cars, buses, trucks, drunks) to think by relex that I am something big enough that they had better avoid me. Upside I can warm my hands by them on cold nights (grin).


Ken