from your local hardware store (admittedly I could hurt myself pretty bad on these if I ever crashed and landed on my handlebars somehow). I usually strap another to my helmet so I can put light where I look instead of just where I steer. I swear by Eneloop batteries and a good MaHa charger that independently charges each battery. I run two PlanetBike SuperFlashes for tail lights....these suckers are bright and the batteries last a long time. A charger that independently charges the batteries is a great idea. Most of the cheap chargers, charge the batteries in series, which is actually very dangerous if you try to charge two batteries that have been discharged to different levels. I have a cheap two battery charger that charges in series, so, I have to charge one battery at a time. I'd have to agree that 400 lumens has got to be super bright!! I personally like to use the Dewalt flashlight that came as part of a kit (along with a 12V cordless driver). I strap it to my bike when needed, and use it for a regular flashlight at other times. The battery exchanges with the 12V driver, making it conveniently useful more often than a regular biker light. Here is the light, but I didn't buy it this way, I got it as part of a kit/sale/combo at my FLHWS. I agree, I find particularly faceslapping the comments about how "This light is too bright to shine in peoples