Check the
deal extreme website for cheap LEDs. Free shipping, too. I haven't ordered their car LEDs, but I have a number of their flashlights and they're a great value.
While my long-term plan is to build an LED headlight, in the short run, I'd at least like to make an LED daytime running light I could turn off. Driving in the morning, I don't need illumination to see the road, but I sure want it to avoid getting hit by sleepy drivers.
Nice job on the testing, Brucey.