400-Watt Metal Halide MH High Intensity Discharge HID Grow Light Bulb
Hydro Crunch MH (Metal Halide) Grow lights have an effective spectral distribution for stimulating vegetative plant growth. Metal Halide Grow Lights emit light most heavily in the blue wavelengths of the electromagnetic spectrum. Metal Halide bulbs stimulate vegetative growth in plants more efficiently than other light sources designed for growing plants.
Lamp compatibility: operates on 400-Watt digital or 400-Watt magnetic ballast