Upgrade your fluorescent fixture to LED technology with the Feit Electric PL13AB/H/CCT/LED color selectable horizontal PL bulbs. Designed with a horizontal G24q-1 4-pin base, these lamps easily replace existing downlight fluorescents, while providing longer-lasting and more energy-efficient light. Use the switch on the bulb to choose between 2700K Soft White, 3500K Neutral White and 4000K Cool White color temperatures. Versatile installation allows both plug-and-play replacement or operation without a ballast after basic rewiring of the fixture.