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Using a thicker pad seems like the wrong way to go.

I would guess integrating sphere.

The Cree PCT says 9 CXA2530 add up to 332V @ 700mA. http://pct.cree.com/dt/index.html The Mean Well HLG-240H-C700 would work. (Constant current region of 178 ~ 357V)

The reason is osmosis. A pH sensor probe has a semi-permeable bulb filled with . . . I forget but that's the source of my problems. Being fed up with Hanna, I bought a pair of Hach sensors which were advertised as dry storable. Total BS--they were received dried out. (I got my money back...

The Cutter price for CXB3070 is attractive compared to CXB3590. The two series can be compared using the PCT spreadsheet from Cree. http://pct.cree.com/dt/index.html I'm not familiar with Vero so I don't know how they compare to CXB3070.

Aesthetically, I think lenses look more professional. I don't have an informed opinion about function.

I see the 12 COBs now but they can't be the 3590 style, I don't think. The luminaire is too small to hold 'em.

Zblade, do you have a retail source for the Cree kits? Edit: Platt.com. cesco.com. There is only one COB, driven at 160W or 240W. I'd rather spend $420 on this: http://www.tastyled.com/product-p/v4-200.htm

I guess I'm old but I use the Intermatic T100 series. http://www.intermatic.com/en/products/timeswitches/mechanicalswitches/24hour My hands are not real strong; I use pliers to tighten the trip dogs so the wheel is slightly dimpled.

APV 12-12 is rated up to one amp. A 2W fan @ 12V draws about 0.17 amps. 1A / 0.17A = 5.88 so it looks like you could run five fans for sure. As pickledlsd says, the fans are connected in parallel. Edit: what AP said.

Check the data sheet of the driver you intend to use. The better quality Mean Wells will have a graph showing efficiency vs load.

I thought it was power applied at the COB(s). Edit: as above.

I've been KISS (simple). GH MaxiGro in veg, MaxiBloom in flower with Pro-Tekt silicon and Ful-Power fulvic. And before someone says GH is Scotts which is Monsanto--no, but there is an exclusive marketing agreement for Roundup.

Yes. HLG-240H-C1400A dims to 50% with an internal pot. The "B" model can dim down to 10% with an external potentiometer or resistor.

I think you want the Arctic Alpine 64 Plus http://www.amazon.com/ARCTIC-Alpine-Rev-CPU-Cooler/dp/B001A5V1K2/ref=sr_1_6?s=pc&ie=UTF8&qid=1456276099&sr=1-6&keywords=arctic+cooler

You know H&G moved from Holland to the US? Some production was interrupted but I haven't heard problems like yours.

Yeah, you're talking 450W. The HLG-185H-C1050 will drive 5 at about 36W each.

I'll assume you have the 36V version. Mean Well HLG-240H-C700 will drive 9 of those at a little under 25W each. The HLG-185H-C700 will drive 8. At that low power you probably don't need a fan if you have an appropriate heat sink.

I wouldn't think so.

This is the best LED grow forum on the web, at least for cannabis horticulture.