Wow, it looks like there a lot of solar powered stuff that’s coming out lately. Check out this instructable that shows you how to make a solar powered bike helmet with night lights!
This project could be done in many different ways and I spent a lot of time trying different parts and ideas. The key breakthroughs for me were to use 3 AAA batteries, vs the 4AA’s that came with the Solar Panel because they were a better balance of weight to the right amount of power and millia