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I would go with cobkits as long as you leave 24 1818 in a few days so i can get them

I will also add kingbright only has 3000k and 3500k anything else and you have to order 200 from them

Kingbright is $22 each but they are going on holidays until feb 6th and @CobKits may work something out for you depends how many you are getting at once.

This is what I was referring to using my area and the 2 different cobs The number I am looking at is PPFD Citizen.1212C4.3000K 71 COBS @1.4A ON 5.88 PROFILE HEATSINK 96 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER KWH Total power watts at the wall: 3858.06 Cobs power watts: 3588...

Yield yes that is correct 1gpw is obtainable yes 50k hours is what they say don't know actual time because in 12/12 that is 11.4 years they haven't been around that long. distance is a good general starting point. Yes it will cover your area a better option would be...

Do you want to dim the leds? then a B version is needed or do you want software dimming? then D2 I would use elg-240-54 d2 for software dimming If you wanted pot dimming hlg-240-54-b If you wire 2 cobs per diver it will be 2.2A each 3 cobs are 1.5A each and 4 cobs is 1.1A

For me the decision was easy I have 96 sq feet of flowering canopy and if i choose the 1212 I would need 71 of the 1212 cobs @1.4A to equal 48 of the 1818 @ 1.4A so 1212= $923 1818=$1056 Ok $125 difference so far Drivers I wanted built in software dimming. so that leaves you with the elg...

you wouldn't need 12 cobs for a 4x4 unless your diving them around 1.0A if you went with 9 cobs of either 1818 or cxm and drove them at 1.4A it would give you a ppfd of 870 and at 2.1A you're at 1265 ppfd Those numbers are from the cob calculator and for the 1818 The cob tells you what the...

why not use self tapping screws

The vero is a good chip you just get more ppfd with the citizen or luminus with the same amount of cobs you also can run the citizen harder if you wanted. Using the led calculator VERO29.V2.0.4000K 9 COBS @2.1A ON 1.813 PROFILE HEATSINK 16 SQ.FT. CANOPY 93% EFFICIENT DRIVER @10 CENTS PER...

Here is the led calculator it will give you the ppf and ppfd numbers https://www.dropbox.com/s/hqgj9n5qxb9xrei/DIYCOBLEDCalculator.jar?dl=0 In my flower room the frames are about 6" shorter than the scrog it is covering. I also chose reflectors. If there is no more room on the driver for...

I would try 7 is 846 ppfd or 8 is ppfd 963 citizen 1818 or luminus cxm22 driven @1.4A

maybe 1050 i dont know yet

I like the ELG series for the built in software dimming so I will be running 3 of the board on ELG-240-1400

I would take 2 heatsinks with the 6 boards that i have coming

No you would need 6 for a ppfd of about 970 the 1818 @2.1A would be 6 cobs would be 890 ppfd Edit= 5 of the 1825 would be a ppfd of 808

I understand that nothing wrong with getting what you can and upgrading later. Get a few harvests and things can get easier to buy. Since you already have a batwing maybe put the money into a portable ac and go from there.

Not $1000 but $600 if you diy and look for cheaper prices

1.4m = 4.6 feet so 21 foot with what you picked out it would give you a ppfd of 465 Depends on what your target ppfd is. If you did 16 cobs at 1.4A it would give you a ppfd of 800

That will give you about 800 ppfd for the area