Sylvania technology gives them super-efficient, quality, compact fluorescent lamps. The Sylvania 20899 bulb is a 57-watt CFL that is perfectly suited to downlighting in offices, retail stores, and commercial locations. With an intensity of 4100 lumens, this lamp provides an abundance of light at a color temperature of 4100K. This 4-pin CFL may be used with electronic dimming ballasts to provide a full range of ambient warm white lighting. At 12,000 life hours this bulb will outlast any equivalent incandescent. This high performance lamp will satisfy all your lighting needs and works great in medium and high-bay applications.