Description Sunmaster Metal Halide Lamp for use during the vegetation phase of plant growth. Sunmaster Metal Halide Bulb will fit any reflector with an E40 lamp holder and require a ballast with matching wattage to run the bulb safely. please note if you use a metal halide lamp in a dimmable digital ballast, you must set the wattage to the exact wattage of the metal halide lamp.
