I have a 3 watt luxeon LED mini mag light that is powered by 3 AA batteries mounted on my bike. It's frickin' bright and the battery life is pretty good too. The 3 watt luxeon LED mini mags are only recently on the market - last couple of months or so. The LED lamp market is getting to be like other electronics, better and brighter for less and less $$$. You can find them at Wal-Mart, they are about $25.00. They really are worth a look IMHO. I mounted mine to the bars with a couple of small hose clamps. If I need to work on the bike in the dark or for any other purpose, it's super easy to get off and on with the hose clamp solution. I know it's pretty low tech and not bike shop sexy, but what the hey, it is a solution that works really well for me. I also have a Bell flashie on the back and it seems to be plenty bright enough too.