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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. Hydro Crunch 400W MH bulb: Lumen: 38,800 Lamp compatibility: operates on 400W digital or 400W magnetic ballast Color temperature: 6,500K Base type: Mogul E39 base Color index (RA): 75 Expected life span: 10,000 hours Safety S51 ANSI Spec Application: Vegging