Compact Fluorescent grow lights (CFLs) are energy efficient. While not as efficient as HID lights, fluorescent have better color and spectrum renderings, meaning more useful light to the plant per watt, although not as much intensity as a HID light. For this reason, keep them 6" to 12" above your canopy. Get blue, cool, or 6500k spectrum for vegetative growth and red, warm, 3000k spectrum for flowering phase.
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