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Why don't you just settle for a cx-9 from Johnsongrowlights which is 33% under your 1500 dollar budget in a 4x4 area which also happens to be 33% smaller than your specified 5x5 Fits your "challenge" well enough

This site is the only one that sells a 900 watt light for 1500 dollar. http://www.bcblondes.com/Cree-cxb-3590-led-grow-light-with-meanwell-driver-p/bcb-900rw.htm But they're currently sold out...

2ppf/w seems about right with CXB3070 @ 30 watts each or so. Edit:I forgot to add .5 after 2.

Because people still buy those panels. And CXB3590 @700mA vs 300 xp-G2 is not a very fair comparison either way since the CXB is much more efficient at that current so you'll need less watts and thus less cobs besides saving on your energy bill. I'm comparing lumens because since they're Cree...

COB is way simpler to montage. Just 2-4 holes for 1 cob and it's all done, SMD is a lot more work. And using the Cree calculator... http://pct.cree.com/dt/index.html The best bin for XP-G2 @ 80cri is R5 At 350mA it does 155 lm/w but it's only a 1 watt light. At 700mA it does 135 lm/w but again...

Those Chinese leds have zero quality control besides them being a lot less efficient even if the Chinese claims are true. Their ebay page says 9000 lm at 1000 watts but doesn't specify at which colour temp. It's a lot less efficient than both Cree and Bridgelux cobs. Any way, 10 of those Chink...

bal-group I think.

The AB bin is older, I also included the newer AD. Why did you conveniently ignore the more 10% more efficient cob which is the one you buy these days, not the 2.11 AB but the 2.34 umol/s/w 3070 @ 50W

Philips 1000W DE HPS = 2.07 umol/s/dissipation W (41.5% efficient) Philips 315W CMH 4200K = 1.95 umol/s/dissipation W Bridgelux Vero 29 3K V2.0 @ 79W = 1.97 umol/s/ dissipation W Cree CXA3070 3K AB @ 52W = 2.11 umol/s/ dissipation W Cree CXA3070 3K AB @ 25W = 2.46 umol/s/ dissipation W Cree...

They're sold out though.

Probably the cheapest Cree panel I've ever seen $/watt

Space is there to be used. What's the point of having unused space? Do you also buy HDDs for your PC and not use them because you enjoy the empty space?

Also would like to add that in an area with reflective walls, the inverse-square law doesn't really apply since light doesn't get lost in some sort of vacuum but a lot of it gets reflected to the plants where it's meant to be.

There are a few real high power COBs. The CLU550 from Citiled recently got updated and is more efficient than HPS at it's typical current rating which is 2.34A which translates to 243 watts and it's max power goes up to 595 watts. This all from a chip that's barely larger than a vero 29. Flip...

Everyone?

He doesn't like the fact that high wattage Cree panels take up too much horizontal space.

180 watts isn't false, just outdated. The older 100x3 was 180 watts. The newer 5 watt leds are more underdriven than the old 3 watt leds which adds a little to the efficiency.

Not all. That's a lie. You can achieve higher grams per watt ith quality led lighting. Test was a little flawed though.

But somehow HPS isn't a glorified streetlight? Also using caps lock will prevent your little finger from getting strained.

You mean a cool higbay/stadium light* CXB3590s/3070s aren't living room lights.