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HID - High Intensity Discharge Lights
HID grow light bulbs are a sealed tube filled with gas that creates light when the gas is ignited by two electrodes that arc current between them.
MH - Metal Halide

MH grow light bulbs should be used for the vegetative phase as they give off a blue to white spectrum
HPS - High Pressure Sodium

HPS has a red or orange tint and is used primarily in the flowering phase of your plant's life.
CMH - Ceramic Metal Halide
CMH grow light lamps are a relatively new source of HID light that is a variation of the traditional Metal Halide HID lamp.