First time LED/DIY.

Hey everyone, I'm not new to growing, but I am new to LED, especially DIY.

Ive been interested in LED for quite a while but never took the leap. I have a great new grow room available to me but limiting heat and power consumption will be a factor.

My plan is to do my veg in a 4x4 room. I was planning to just run some t5s until I could afford another 9 cob lights or so.

I'm mainly focusing on the flower room right now. 4x8

I am going to be using 18 of the citizen CLU048-1212C4.
I have my heat sinks picked out, 3.9"x3.9"x2.9" - 1 for each cob. (Should be fine for passive but im going to have a fan above the lights as well so it should be actively cooling it somewhat)
I was planning on using 4 hlg-185h-c1050b to power all 18.

I was going to set them up in bars of 3 lights, so it would be 6 bars with 3 lights a piece spanning the 8' section. (I'm aware the wires might be a mess considering i can only run 5 of the CLU048's on 1 driver. Not really sure what else to do without changing my entire idea.)


My main questions are:

cob directly on the heatsink or go with the holders?
reflectors or no reflectors?
Is it enough light for a 4x8?
Lastly, I was going to go with 3000k for all of them, even when i add more for veg. Would you guys recommend a different temp if they will only be used for flower?

Thanks everyone, any hints/tips are appreciated.

So with a 36v COB at 1050ma..... 36V x1.05ma x18COB= 680.4 W consumed.....4x8 area....
680.4/ 32 ft2= 21.26 W/sqft...... Most will agree that's a bit on the "light" side, of light for flowering a 32sq ft area.....

EDIT: Also, definitely dive into the Cobkits thread for design questions.

Citizens 1212s arent that cheap once you account for all the extra heatsinks/metal work...or efficient, id ask @CobKits for this.

[Luminus cxm 22 gen3 960w kit]

*12x 125mm Square splayed pin heatsink or 140mm straight pin.
*12x luminus cxm22 gen3 cob.
*12x 0.5mm Arctic Thermal pad.
*12m solid core wire.
*4x Meanwell HLG-240H 1400 or 54 Driver.
*8x 5 Way wago connectors.
*4x Ip67 cable connector.
*4x 2m wire with plug.

Ben123456733 said:

cob directly on the heatsink or go with the holders?

Click to expand...

holders all day long. you only need to roach one dhip with a bad solder day to pay for all teh holders. cleaner install all around.

Ben123456733 said:

reflectors or no reflectors?

Click to expand...

you can add them later if you used holders. pretty much unnecessary in a reflective space