The Digilamp 945w CMH is a double-ended full-spectrum lamp for all-cycle growing. Coming in at 3,200k this bulb emits a bright white light that promotes strong growth in plants. This bulb is long-lasting averaging out at a 10,000-hour life span. The ceramic metal halide lamp only works on low-frequency electronic ballast and magnetic ballast. It will NOT work with high frequency electronic ballast