150 Watt, 120V Coralife Replacement HQI DE Metal Halide 10K, 10000K Bulb 150W RX7S Color Spectrum: 10,000k (Kelvin) Operates on a HQI Metal Halide Ballast, Pulse-Start Ballast or Electronic Ballast Best Combo of Color and PAR Compatible bulb Guaranteed to meet or exceed manufacturers specifications