Solar powered lights are good; they do, however, require batteries and they are hard to charge late in the night when a child have time to study. Gravity is with us always and 3 seconds lifting will give you 30 minutes of reading.
Crowd funding is closed, they got ten times what they asked for — and they deserve every penny. Click and be amazed; this will change the world.
Keep an eye out for these guys at the deciwatt project; they will change the world.