While many in the lighting industry are aware that US DOE recently issued a Final Rule for a definition change of general service lamps (GSL) as well as General Service Incandescent Lamps (GSIL), many in the industry don’t realize the impact of this expanded GSL definition on many LED lamps. Most of the public discussion around the new GSL definition focused on the addition of incandescent and halogen specialty lamps to the regulated GSL category. However, the new expanded GSL definition encompasses many LED lamps, in addition to incandescent and halogen.