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http://www.cooliance.com/NA/Products/LED-Coolers/LED-Coolers-For-Cree-Arrays.html Edit: I don't need heatsinks but I want some of these active ones. "The Coolstrate module consists of a controller circuit, a special low noise, high efficiency, long life fan and an ultra low thermal resistance...

Has anyone asked meanwelldirect.co.uk for a quote on the HLG-240H-C series? http://www.meanwelldirect.co.uk/products/250W-Single-Output-Constant-Current-LED-Power-Supply/HLG-240H-CA-Series/default.htm...

u got seedz. Pistols: http://www.cabelas.com/category/Semiautomatic-Pistols/105529680.uts

In addition to the good comments above, I'd say define the grow space and buy/build a light system specifically for it. Include the ceiling height in your decision. I have a room of Lumigrow lights but I can't recommend them. Grows impressive bud but they pump out considerable heat...

Littlejacob, the HLG-240H-C series has not been released yet as far as I know. All I can find is the preliminary data sheet hosted on the Mean Well UK site. http://www.meanwelldirect.co.uk/public/ranges/pdfs/r1981/r1981_3.pdf

My Shackzilla is half SSH and it stretches almost an inch per day for the first five weeks of 12/12hr. That is under Lumigrow LED, hempy buckets or Tropf Blumat in coco. I wish the Mel Frank book had the color photos and graphics of the Cervantes book.

Grip the blade with a towel? Be professional, wrap it with tape ;)

Oh, for a framework, wood would work. But as you say, Humanrob, aluminum can be used to good advantage thermally. I think I'll add some thermal grease between the structual aluminum sheet and the heatsink extrusion of my next build. If making a single luminaire, a hacksaw works OK on the...

I recently wanted to compare the flux of a CXA3070 with CXA3590 but the published test data is taken at different currents. Solution, the Cree Product Characterization Tool (PCT): http://www.cree.com/LED-Components-and-Modules/Tools-and-Support/Tools The plastic fence posts have CPU heatsinks...

Thanks, CanadianONE. I just recently started studying COBs and I've seen the Cree PCT referenced before but hadn't tried it. http://www.cree.com/LED-Components-and-Modules/Tools-and-Support/Tools

When comparing flux of the different series, notice the test current is 1400mA for CXA3050, 1900mA for CXA3070, and 2400mA for CXA3590. If my rough calculations are correct, the CD CXA3590 will only be one bin level brighter than the AB CXA3070 when both are driven by the same current.

It's Verical.com, the surplus outlet site of Arrow. Most COBs have 20 or 100 minimum quantities but my CXA3590 36V 5000K CD (ANSI color code) were the last three and went for $32.20 each. Newark notified me tonight that my $8.50 COBs and Ideal 50-2234C holders will ship tomorrow.

Newark is weird. The $8.50 COB inventory was reduced by the eight that I ordered but the order is still pending.

Maybe we need a "fatwallet" COB thread. I really wanted a 5000K luminaire and I already have three CXA3590 so I ordered a half dozen CXA3070-0000-000N0HAB50F from here: https://www.verical.com/pd/cree-led-cxa3070-0000-000n0hab50f-879109 $21.47 each, any quantity, free UPS or Fedex ground...

My plan:

It is a good idea to ground metal hoods.

Comparison with Vero 13: https://www.rollitup.org/t/cxa3050-for-8-50-thought-i-was-dreaming.881273/ bbspills "Cree CXA3050 100W Custom LED Grow Journal with Dinafem Blue Widow" 2700K (x2) thread: https://www.rollitup.org/t/cree-cxa3050-100w-custom-led-grow-journal-with-dinafem-blue-widow.733157/

Looks backwards. The center contact needs to connect with the black wire. White wire is neutral.

Is this the graphic, Abiqua? Some people might be disappointed--the Newark site does not update available inventory after an order is placed. I don't really care if my order is canceled; I need to stop hoarding COBs.

Thanks, CanadianONE. I happen to have some APC-35-500 drivers and heatsinks on the shelf so I'm in for some passive dual COB side bars, 17.5W to each 3000K CXA3050. Free shipping to US if over $50.