Ross wrote:OK, what I was getting at was why don't cars use LEDs and Lumens? Probably won't get an answer because this is a bicycle forum!
Cars can be had with LEDs, with halogens, and with HIDs.
Its just not a major sales issue, because the impact of the different systems on a car is minor, and sufficient electrical power is available to power any number/power of lights. Efficiency is not that critical.
The impact on power vs light impacts battery life significantly for a cycle light, therefore its far more important. We'll only carry a finite weight of batteries, and we'll only pay so much for them too...