On my smaller frame bike, I don't want cables and battery packs and prefer a single 18650 flashlght. XinTD C8 V5 XM-L2 U2 1A 18650 Flashlight on the bars, Panasonic NCR18650B Protected 3400mAh a pair of protected Panasonic 18650B batteries (high drain) and Universal Motorcycle Cigarette Lighter Flashlight Holder - Black - Free Shipping - DealExtreme holder and you are all set. Add a Shiningbeam S-mini to the helmet and you are all set with about 1300 lumens of brightness. Total cost about $100. I've been really happy with this setup for commuting in the dark at 20 mph. The recently purchased the XinTD and it is noticeably better than the previous C8 flashlight I had.