Brian James needed a light bulb. Just one little bulb to replace a 40-watt light that burned out in his stairwell. How hard can that be? Pretty hard, it turns out. “I’m balancing the expense versus ...

Three: a halogen, a CFL, and an LED. (Rimshot.) Don't get it? You will on Jan. 1, 2014. That's when manufacturers will stop producing 60-watt and 40-watt incandescent lightbulbs to comply with a ...

Quantum dots that produce white light could be the light bulb’s successor But chemists at Vanderbilt University discovered a way to make quantum dots spontaneously produce broad-spectrum white light.