Quote Originally Posted by knna
Today the weak part of a led grow system is the blue part of the spectrum. Blue leds are still too inefficients and expensive.
Could have sworn I read somewhere that you need 7% of your total grow lights to be blue, anymore wouldn't do anything.

BTW, I haven't seen any experiments that match the wattage yet. Would be cool to see what 600 watts of led can do to a plant. Look at this experiment, http://www.ledgrowlights.com/univers...nn%20study.PDF

Another question: would it make sense to put a larger viewing angle in the middle and then decrease it on the outside. Lets say I create a circular bulb. Use 45° in the center, 30° halfway between the center and outside, then switch to 15° on the outside.