see, i thought i had a lot of light too, then i got a 650 lumen light as an extremely generous gift.

don't mess with battery powered LED's, even if they are 3 or 4 watts. you're fooling yourself into thinking that you can see anything in time... if you're riding at more than 5mph you need a real light.

save the money you'd spend on batteries and get rechargable lights, even if they're just the cheapest rechargable halogen you can find.