Less draw is fine. My TR2 came with 6V headlights. They were so much brighter than the old, yellowish 12v lights that I decided to retain them. Seemed like a good idea. The first time I drove the car at night the 6V headlights cooked the dynamo! It turns out they were drawing 20 amps, instead of the stock light's 10 amps...and the dynamo was only rated to 19 amps.