LEDs move beyond light bulbs, into carpets and ceilings

LEDs are no longer just light bulbs. They're now starting to appear as a built-in feature for ceilings — an advance predicted 50 years ago by science fiction writer Isaac Asimov. These tiny light emitting diodes, often touted as the ultra-efficient replacement for old-fashioned incandescents, are being integrated into clothes, carpets and ceilings the same way that some solar panels have been tucked into rooftop shingles.