New Scientist Tech - Breaking News - Quantum quest leads to super-efficient lights: "A light that lasts 20 times longer than a conventional bulb and is 75% more energy efficient has been developed by researchers.

The light is based on organic light emitting diodes (OLEDs) that use a novel combination of photon-emitting compounds to convert more energy into light than existing versions. It was created by Stephen Forrest from Princeton University in New Jersey, and colleagues at the University of Southern California, both in the US."