The ballast-compatible PLL Lamp is the fast and simple way to upgrade downlights and commercial luminaires to the energysaving benefits of LED. This plug-and-play replacement lamp operates off the existing instant or programmed start fixture ballast ? no rewiring required! Designed as a seamless replacement for 40-watt CFL tubes, the LED PLL lamp consumes 50 percent less energy and lasts twice as long as its fluorescent counterpart