Underwriters Laboratories, Inc. (UL) announced today that it has acquired Luminaire Testing Laboratory (LTL), based in Allentown, PA. LTL is an independent testing laboratory that provides performance testing of lamps and luminaires and is one of five laboratories approved by the Department of Energy (DOE) for ENERGY STAR® qualification testing for LED lighting products. The acquisition bolsters UL's leadership in the lighting industry, which is a strategic market for UL.