Metal Halide Lamp (MH)

A High-Intensity Discharge lamp in which the light is produced by arcing electricity through a mixture of metal halides. The light produced by metal halide lamps is in the white-blue spectrum, which encourages vegetative growth and “bushiness” while discouraging upward growth. This is the bulb to use in the first, vegetative phase of plant growth. This term is often used interchangeably with Ceramic Metal Halide Lamps, but there are differences between the two.