Hydrofarm Phantom CMh Reflector, Ballast & Bulb kit Excellent PPF (Photosynthetic Photon Flux)-1.95 mols/s Longevity-90% PAR output at 8,000 hours and 20,000-hour average life Horticulturally-optimized spectrum and increased UV promote enhanced plant quality 4200K lamp included Digital ballast features low frequency, square wave technology