To make matters worse, light suffers from the inverse-square law, meaning that the part of your plant that sits two feet from the light receives only 25% of the intensity received by the branch that is one foot away from the light.
This means that your 1,000-watt light is only a 250-watt light at two feet. Ouch! To counteract this problem and get huge production under the canopy, a lot of growers supplement their overhead lights with vertical lights that get closer to the sides and bottoms of their plants. This can mean much higher yields from a single plant because the whole plant is producing top to bottom.
The problem is that HID lamps put out a lot of heat, which can burn your plants (and yourself), if you’re not careful. It’s one thing to have all that heat above your head; it’s another to have it at body level. Just hanging a hot bulb from an overhead socket like a pendulum is not safe. Here’s a great way to install a properly cooled vertical light so that your plants can get maximum lumens for minimum cost.
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Monday, 17 February 2014