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Available at nearly any respectable hydroponics shop, you can discover the innovation of ceramic metal halide grow bulbs. This type of high-intensity discharge (HID) light has been specifically engineered to resemble the spectrum of light put out by the sun, closer than any other grow light out here. Best of all, is the fact that one CMH light is perfectly suited for both vegetative and flowering cycles.
Additionally, you won’t need an expensive digital ballast with these lights, but rather a standard ballast for HID lighting. Using a digital ballast can actually harm CMH lights.
Depending on the brand you choose, 400watt ceramic metal halide bulbs will put out anywhere from 32,000 to 36,000 lumens, have a bulb life around 15,000 hours, and can typically be places horizontally or vertically. CMH lights also make plants grow slightly faster than normal. If this is an unwanted trait, simply add some silica to the soil, which should slow this process down to a normal level.
CMH bulbs can also get quite expensive, but are worth the cost and will save you money in the long run. Just think about the fact that now you only need one bulb for all your needs.