California Lightworks SS550 SolarSystem 550 LED Light, 440W, RED 88 Super High Flux US made 5 Watt LED emitter diodes Built-in 2 X 15 Watt UV-B T8 tubes with a separate switch Uniform 90 degree jewel quality glass primary optics, no secondary optics Uniform, 3' x 3' core coverage area, no wasted light High photo-synthetic photon flux (PPF) to penetrate canopy and deliver unparalleled yield results