Saves energy costs by replacing incandescent bulbs with fluorescent. Standardized GU24 socket eliminates pin confusion when replacing lamps or switching to a lamp/ballast with higher or lower lumens. Ballast and lamp are integral, so the overall length isshorter, allowing better fit in some applications. 2700K color temperature. Compatible with models 28439, 28459, 28460, 21433, 21434 and 21435. ENERGY STAR qualified.