In late 2012, the California Energy Commission (CEC) published a voluntary specification recognizing quality LED lamps intended to replace screwbase incandescent lamps in luminaires. Called the Quality LED Lamp Specification (QLS), it covers a range of omnidirectional and directional (spot and flood) lamps. California utilities are now required to promote lamps that satisfy the spec in their residential rebate programs.
ELECTRICAL CONTRACTOR has the story here.