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What is a Metal Halide (MH) Lamp?

A metal halide lamp is a type of high-intensity discharge lamp (HID). An MH lamp contains an arc filled with a mix of metal halides.

How are Metal Halide Lamps Used in Cultivation?

  Metal halide lamps produce light that falls within the white-blue spectrum. Growers who choose to use HID grow lights favor MH bulbs during the vegetative phase to promote bushy growth. When flowering begins, they exchange MH bulbs for the red glow of HPS lamps.