I use three COB chips to cover a 2'x 5' area ,I run them at 50 watts each,so 150 watts that size is cheaper than t-5s,I get about 40000 lux at top of plants,the nice part is that they are dimmable and white, not that nasty burple color.I can actually grow very nice lettuce organically quite a bit cheaper than buying it at the store.it's a win win situation.
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