Metal Halide lights are a type of High Intensity Discharge bulb used by many indoor gardeners. It creates a very intense light in the blue range of the spectrum and is most effective during a plant’s growth cycle.
Metal Halide lamps are HID bulbs and are used by growers because of their ability to produce extremely strong and intense light. They emit light along the blue range of the light spectrum. These longer wavelength of light are most often used by growers during the growth cycle. The blue light helps plants to develop a sturdy structure including leafs and stems.
Metal Halide lights are normally used with other types of light that produce light from the other end of the spectrum. There are some lighting designs that include both methal halide and high pressure sodium lights, which produces light on the opposite on the of the spectrum, in combination units.