Quote:
Originally Posted by EarlyPan
Regarding growing under led's it's important to remember that with light, light of any type, the intensity on a surface varies inversely with the square of the distance. That means that if a lamp gives you a given number of lumens on a leaf at a distance of one foot and you double the distance to two feet the lumens will decrease by a factor of four. It's also difficult to compare light of different lamps, even two different color LED's, because of difference is spectrums.
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The inverse rule applies within the
lights normal throw. LEDs have such a short throw at all that moving them beyond about 6 inches is pointless for plant growth unless for some reason you *want* plants with nodes about 3 feet apart...hehe
It would be like using an HID eight feet from the plant. Sure, the plant may survive, but it would be a very sparse plant with practically no growth.