My DIY light: a couple of CREE LEDs powered by the Shimano 3N71. I printed the housing on a 3D printer at my old Institute. It's pretty bright, maybe 300 lumens, but could use better optics since it spills a lot upward (I have one wide angle lens and one tightly focused one).
https://picasaweb.google.com/konens4...04701248748610