It’s that time of year again, when lots of U.S. residents are blasting the heat in their homes and still freezing cold.

More than one-fifth of US electricity is used to power artificial lighting. Light-emitting diodes based on group III/nitride semiconductors are bringing about a revolution in energy-efficient lighting ...

LED bulbs come with big promises, like energy savings and lights that will last for years of use without burning out like old incandescents. Many of those promises are true, but we bet you've noticed ...