Compact fluorescent housings for use in commercial applications. These CFL housings are designed to handle varied applications including use in insulated ceilings which can be in direct contact with ceiling insulation and an air-tight design which prevents airflow through ceiling for saving heating and air conditioning costs. This housing offers a wide choice of trim types including reflector, lensed and wall wash trims. G24D/Gx24Q socket for use with 4-pin DTT, TTT lamps. Thermally protected electronic ballast. End of lamp life protection is standard.