[klynk]

Yeah, I know - it's not a DIY, but I liked the idea of versatile light:
http://www.manafont.com/product_inf...wer-4mode-memory-led-flashlight-118650-p-5196

 

[zemike]

The "recoil" part is useless for a bike light.
I have a "recoil" flashlight.

 

[Zigger Suddenness]

"flood" part also useless for bike - i tried similar setup.

 

[troutie-mtb]

Well that just about sums that one up in three posts