The Glow Brick, designed by Sam and Jude of Suck UK, is a cute little cordless nightlight made from a phosphorescent light bulb (yes, a real light bulb) embedded in a block of acrylic. It requires no electricity and can glow for up to three hours, ‘powered’ only by the light it soaks up from the sun or other artificial light sources, making it as energy-efficient and eco-friendly as it is clever.
Glowing with the aid of phosporescence (like the glow-in-the-dark stars on your childhood bedroom ceiling), the Glow Brick employs an often-overlooked material for efficient energy generation. Phosphorescence is an extremely promising source of energy-efficient light.
Original Source: Inhabitat