Twofish Lockblock: http://www.amazon.com/Two-Fish-Lockblocks-Flashlight-Holder/dp/B001CJXB5ENot perfect - wobbles a bit, straps can be fragile - but allows you to use any 1 or 2 cell AA light. Point it downwards a bit so it lights up the road instead of blinding oncoming traffic and you're good to go.