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Hi BeeZmo, We are running a huge sale, 25% off. Just wanted to let you know the sale price of the 4 COB light is $404, and the 6 COB is $599.

I would go with two of the 4 COB lights. They each provide solid 3x3 coverage. With the RIU15 discount the cost would be $916. They don't give off much heat, it would only raise your temp about 7-10 degrees above room temperature. I'm not sure what your budget is, but the 6 COB light would be...

You can try the light and if your not happy with the results, just return it for a refund, we give you 180 days. I'm confident you will be impressed.

Our 9 COB would be more PPF than what you are looking for :-). in case your interested to read more on PPF/PPFD, here is a good link that describes how to calculate PPF and PPFD http://rollitup.org/t/cxb3070-3000k-ad-800w-draw-4x4-tent.874291/page-2#post-11683308

if you are looking to hit a PPF of 850 our 9 COB has a PPF of 1002 (Grow Area: 4’ x 4’ = 16 sq-ft = 1,49 M2, PPFD of 673 x 1.49M2) the more you spread out the lights the lower your PPFD which is a measure of PPF over 1 square meter.

We have some different designs in development, among them is a long strip that can be daisy chained to create an array. On our current design the COBs are spaced about 5.25" on center. The lenses concentrate the light on a 3'x3' coverage area at 18" above the canopy.