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Originally Posted by RichardDean
Red light is the most efficient monochromatic spectrum for plant growth.
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Who says so? Could you point me in the direction of any scientific research on any plant where tests have proved red light to be better for plant growth?
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Blue is in the front of the light train, acting like a spearhead to penetrate the leaf, carrying the other colors with it. The far blue range includes UV-B, similar to what is found at high altitudes, and increases the prized phenolic compounds. This increases the flavor of peppermint, licorice, pepper, etc.
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Well said, I agree completely that blue light is excellent for the terpenes... even in cannabis and will enhance flavour and aroma.
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Conventional wisdom dictates that the growth phase be illuminated by a quartz metal halide (for blue light), the bloom phase by a high pressure sodium (for yellow/
orange light). However, a full spectrum is needed for all phases for a variety of functions. Blue induces growth hormones and rooting, and reduces stem elongation.
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Again I agree with everything here except the rooting. Cannabis works hard (using a hormone called cytokinin) to keep its roots to a minimum. The only reason plants have a root system at all is to better take nutrients. I am yet to find a study on the causes of a plants rooting... maybe you could point me in the right direction?
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Red induces flowering hormones, and provides energy for growth of flowers and leaves.
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Of course red is used too for energy... but i am also yet to read a study that says red light induces flowering. In fact everything I have read suggests that blue is the best for this event. The red light, being the weakest, seems to be a waste of time.
Also by your reasoning on red light, in an absence of red light and an abundance of blue light cannabis would either not flower or flower slower. Is this the case?