Hi If you are not a DIYer then check out Fenix lights. I have the model that runs on 2AA NiMH batteries, 175 lumen, 2 hr burn time on high (more if you turn down the brightness). You could easily stash 6 other NiMH batteries in your pack. The light retails for $60.00. Non rechargeable batteries are cheap, $00.50 each. You will have to mount it to bars or helmet. They sell things called fish blocks but you could easily fashion something yourself. I mounted mine on my helmet with an old Viewpoint helmet mount from my old system.