The Cree XP-G3 LED´s have a illumination angle of 125-130. Subtracting the outer 10% the grow area at 50cm height is 2m x 1m = 3m2. At 1 meter the average µmol/sek. naturally becomes lower, but will illuminate approx. 3m x 3m = 9m2. One of the advantages of LED´s for grow lights is the moderate heat radiation, which makes it possible to get close to the plants without heating up the top leaves, to much. Plants like moderate heat when utilizing the photons to produce plant matter. To achieve the best possible growth, the temperature around the leaves should be regulated. Furthermore it is a good thing to have air flowing across the leaves to evaporate moisture and thereby pull the chain of molecules going all the way down to the roots, where nutrition's are dwelling. The optimal man made system for plant growth will therefore take all these variables into account. The exces heat from the lamps, can be used to provide a optimal temperature inside the growth environment. The heat not used to regulate the growth environment can in turn be used to heat up a living space, it could be stored in eg. water or simply discarded. The trick here is to find the right balance.
Juan-Antonio Søren E.P.
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