L.E.D.S are on par with any light out there. I use them only in both my flower room and veg rooms. I use T5 for clones. I am in Oregon and it is hot as hell up here right now. I have no fans except the ones on the wall to move air. I have a guy make all my lights and he only charges me $349 for each one and they do both veg and bloom. I just cropped and my yields were far better than a friend and his 1000's. I don't have c02 yet but I pulled no less than 550 grams dry from each plant after it was cured and ready. My plants are about 4 ft round also.
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Here are as many specs as I have at the moment. He currently make these lights. He have done the research and put the time into the lights to make them better then whats out there on the market today. His system uses normal LED's with high MCD ratings. The veg spectrum uses 110 L.E.D.S and the flower spectrum uses 120 L.E.D.S. Each led is rated at 15000 MCD, With the proper conversions each LED is about 2.5 watts. When he did the conversions of MCD to lumen it came to 150k or more. A 1000watt system pumps about 100k lumen so mines better then that. Super bright LED's make the penetrating power very high. The other upside to my system over the UFO's that are everywhere is mine in using normal L.E.D.S, that means if you wanted to you could get 1 inch off of a plant and it would produce no heat. Super nice system and i will end this by leaving specs below
Spec's
150k lumen
Dual cycle built into 1 system
No heat produced
True 3 amp system
Mounting bolts for hanging or you can remove them and angle it as it has a 90 swivel
super bright LED's for high penetrating power