Metal Halide Lamps

Metal halide lamps are critical when color temperature matters and must approximate the spectrum of natural sunlight, such as in indoor gardens.

Metal halide lamps are critical when color temperature matters and must approximate the spectrum of
natural sunlight, such as in indoor gardens. It's impossible for any artificial source to completely match the spectrum of natural sunlight, but halide lamps come much closer than incandescent bulbs.

Many gardeners, especially those using hydroponics systems, depend on an indoor lighting system to keep their crops healthy. Halide lamps have a color-rendering index (CRI) rating in the 60s and 70s, with 100 indicating a color rendering identical to that of natural sunlight. High-pressure sodium lamps, in contrast, have a CRI rating of only about 20, making them less useful for horticulture.

Metal halide lamps produce a temperature of 2,700 to 5,500 degrees Kelvin with a resulting CRI in the 80s. If certain crops require a lower rating, metal halide lamps are versatile enough in design to be
adjustable. They also last about 25 times longer than incandescent bulbs, making them a more efficient
choice.

Although metal halide grow lights are more effective overall, some bulbs offer light in the red and blue
segment of the spectrum which is better for budding and flowering. These bulbs have an internal coating that skews emissions toward either end of the spectrum depending on the temperature needed. Many plants need the red end of the spectrum when reproducing. Providing them with light in that range will result in healthier, bigger crops.

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