Not too much , the light are to close, this is what causes the tips to become white (light bleaching) it happens with led's, Some people say that the white tips are swealing of the thc resin glands caused buy uv light emmited from the ufo's and the 660nm red spectrum that can boost thc production. But the solution is to keep your lights 12-16 inchs from plants.
Last edited by canadianhemperor; Oct-21-2011 at 09:50.
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