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Metal Halide Lamps

Metal Halide grow lamps have been used for more than 50 years in indoor growing situations from greenhouses to grow tents around the world. Metal Halide lamps are referred to as HID or High intensity discharge lamps and are mainly used in the vegetative growth phases with high levels of the Blue colour spectrum. Generally indoor gardeners will swap from Metal Halide to a HPS - High pressure sodium lamp when they switch their indoor crop to a flowering stage with HPS being high in the Red colour spectrum.