These girls are studying by DLight. This model costs $11.95 online. It is sturdy, rechargeable, can by hung, angled, or mounted and the obvious benefit - electric lights without being connected to a grid. While we in the industrialized countries flip switches and plug cords in, there are no switches or outlets if there's no grid. And of course electricity is expensive. batteries even more so. Sun is free, and LED bulbs are super efficient.