I ordered a 17 degree 35w 4700k Solux bulb that I've tried with a SLA 12v battery. I plan to use it with a 8 or 12 degree 20w spot in a dual optronics setup. It is a very bright white light with even coverage. I'm using a lightbrain controller and the 2nd setting - approx 66% power is also bright and white. The info for the 50w bulb at
http://www.soluxlamps.com/lighting/s...Specifications
is very interesting. It shows that even at 8v the Solux is whiter than the normal 3100K halogen. My quick test verifies this. I'll try it on my next ride to see how it holds up. I think that a single 10 degree 35w Solux might even be the best tradeoff between power and light.