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Plants grow more quickly when you use a cool tube that keeps lights up to 600 watts from overheating.

Depending on the manufacturer, some tubes have a reflective surface to keep heat away from the plants, and should be placed no closer than 250mm. Some designs require that a small fan be installed inside the cool tube to pull out excessive heat. Purchase a kit that includes a ballast, cool tube, bulb, and in some cases a fan.