I've recently been looking into LED Video Lights for my Canon GL2. There are a lot of great light out there, but they are way to expensive. So I decided to build my own.
The design has gone through multiple stages, but I've arrived at a design that uses an old Canon CG500 charger that I have. I orginally bought it to charge the GL2 batteries, but it arrived DOA. I didn't feel like dealing with returning it, since it was only $20. The LED light actually fits inside of the orginal CG500 case, and runs off the canon battery attached to it. It also can run off of the power connector at the bottom. The light has a TO220 voltage regulator built into the circuit, so you can power it with 4 to 25 volts DC.
I'll post pictures soon.