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look at the cob calculator 24 sq feet not inches

not inches feet

the whole room is 13 x 16 The COB CALCULATOR here is cree CXB3590CD36V3500K 16 COBS @2.1A ON 5.88 PROFILE HEATSINK 24 SQ.FT. CANOPY 92% EFFICIENT DRIVER @10 CENTS PER KWH Total power watts at the wall: 1314.13 Cobs power watts: 1209 Total voltage forward: 576 Total lumens...

First Im not in a 4x2 area each grow area is 3x8 and there is 4 in the room. To convert from hps to led using the cob calculator each 24 sq foot area needs 12 leds x4 =48 leds that is with citizen and cree needs 16

Have a look at the citizen You dont need as many cobs for the same area http://ce.citizen.co.jp/productse/info.php?no=107 With my flower room the difference between cree and citizen was to big to ignore. I need 48 citizen cobs 1818 @2.1a for a ppfd of 1100 If I went with cree 3590 i would...

Try to understand what people are referring to before you start to argue. You're talking 3 watt leds and everyone else is talking Cobs Cobs can handle 100-150 watts each Here is a pic of 3 watt led Here is a pic of a cob

Read the data sheets they tell you a lot..... here is a screen shot of the hlg 240 that the op had talked about. It also tells you about the built in dimming https://www.dropbox.com/s/i6yiq7gf5my4d9j/Screenshot%202016-11-03%2020.39.30.png?dl=0

There are 4 versions of the drivers no letter straight power no dimming A dimming with a pot then B dimming 0-10v and D timmer dimming

I dont know where you are in you project but have a look here at https://hackaday.io/project/11997-mycodo-environmental-regulation-system you can use different sensors and set up rules for anything you want

I was going to wait to post this until I was completed but there is an open source project that is a hack a day finalist this year here is the link to it. https://hackaday.io/project/11997-mycodo-environmental-regulation-system I also grow gormet mushrooms and setting one up for them also...

You are looking for SOOW Portable Cord is recommended for use as portable electrical power and portable control wire cable. With its flexibility and resistance to the effects of abrasion, chemicals, weather and ozone, SOOW Portable Cord is excellent for heavy-duty cable service applications...

Yes my flower room is 13x16 and I have 2 areas that are 3x9 and one that is 3x16 there will be 12 cobs per 3x8 area in 2 rows of 6 with 6 in a 2x4 frame.

The elgs are 220 only and the hlg version is in testing for certifications and not for sale yet. Its mainly personal preference whats available in the room and the ability they have If they can safely create new circuits ect. I can only estimate the usage as half leds and drivers should be here...

Or are you looking at diy because you can put 1000w hids to shame with the right leds

The elg and hlg set of driver has smart dimming profile built into the driver and you can set a monthly schedule or weekly for automatic dimming they also can dim to 0 not just 10% for me this is more important than having less drivers. Just program the driver and then it runs by its self built...

I am using clu048-1812 and hlg-240h-54 as the drivers 2 cobs per diver

#1 Not for flower and veg but for flower only It depends how hard you want to drive them 12@2.1a = ppfd 1260 the same 12 @ 1.05a= ppfd 733 that is covering 16 sqft area Personally I would look at the citizen cobs they are half the price. I am getting 12 to cover a 3x8 area at 2.1a

https://www.youtube.com/channel/UCPSwmwj8ZLXObtBJmz-76rw/videos look for the 7 part series on diy led

those with little imagination or knowledge you dont know how to branch off wiring or use terminal blocks or connectors? bet you didnt consider the wire sizing for the circuit your not running anything smaller than 12 ga wire on the relay now are you

Lets read the description https://www.sparkfun.com/products/13815 they tell you 20A max for a few min they call is a 30 a relay because 10a is possible on the NC side and 20a NO im not making anything up that is what sparkfun published about the relay you are using and linking to In my...