Portland, Ore. — Light bulbs create more heat than light. But a professor at Rensselaer Polytechnic Institute (Troy, N.Y.) has invented a 99 percent efficient, omnidirectional reflector that he claims ...

Hoping to see better while driving at night without spending a fortune, I ordered a set of LED replacement bulbs for the reflector headlights on my new Ford Ranger. Boy was it a good reminder that I ...