Lighting MedGrower does DIY Led build (Citizen COB CLU048-1212)

[MedGrower]

I find this whole DIY craze too interesting that I really need to dip my feet into these waters also. I love LED's and I always hate when my dear units eventually dies out or has problems. This is why I want to do alternative lights that I myself could "easily" find spares and fix it if something goes wrong.

I am planning on a basic light with 4 x Citizen CLU48-1212C4-403M2K1's.

Their specs are as follows:
CCT(K): 4000K
CRI: 80
Forward Voltage: 34.6V
Current (max): 2.76A

So as I understood, maximum current that I single COB can take is 2,76A (2760mA) before it goes kaboom, and therefore I better aim significantly lower than that because of safety reasons. With 4 cobs the minimum voltage required would be (34.6V *4) = 138,4V.

Because I am a total beginner to this, I am planning on doing active cooling. My question is that would it be advicable to connect the fans that used in the cooling in the same series with the COBs, as long as the fans can take the amps? I guess that also raises the requirements for total voltage output from the powersource.

For a powersource, I am planning on getting Meanwell HLG-185H-C1400A but as I am checking it's output voltage I only can see this info: 71V ~ 143V and I am like WTF that means really? Is the voltage adjustable? Would this be a good and safe powersource for these COBs for newbie like me? I guess with 143V as a maximum voltage from the driver, I need to arrange a separate powersource for the fans?

My growspace is 60cm x 120cm so I am planning on having a light in about 20cm x 60cm size.

NOTE THAT THIS IS (SLOW) WORK IN PROGRESS AND I REALLY APPRICIATE ALL THE HELP AND OPINIONS ON THESE (POTENTIALLY SILLY) CHOISES I AM MAKING

 

[BigSm0]

Just took a quick glance at this since I'm out. You will need to run a separate driver for the fans if you go active. Also the 1212's at 1400 ma draw 36.15 v each. It tops out the driver but does work.

Happy to see more interest in this section.

 

[dankle]

I use a HLG-185H-1400A with 4x 048-1212s and they work well together

 

[MedGrower]

Just took a quick glance at this since I'm out. You will need to run a separate driver for the fans if you go active. Also the 1212's at 1400 ma draw 36.15 v each. It tops out the driver but does work.

Happy to see more interest in this section.

I use a HLG-185H-1400A with 4x 048-1212s and they work well together

Hey guys thanks for confirming this for me. I will go ahead and get one of those. I am still teased about the possibility of doing passive cooling for these COB's. Is there some resource anywhere where I could study how to design optimal passive heatsink. Or do you guys already know what parameters for a passive heatsink would work for these COB's? I see these can handle up to 100C in operating temperatures so that is quite a lot.

 

[BigSm0]

Mechatronix is a good place to start. Heatsinks are anywhere from 10-20$ to cool 50watts. I wouldn't make my own at that price. Another good source is northern grow lights. He offered a bunch of different sizes.

 

[MedGrower]

I did do some digging around and found this one as a potential passive cooling for CLU048's: http://www.heatsinkled.com/EtraLED-CIT-130100-for-Citizen-Modular-Passive-LED-Cooler-Φ130mm-p07982507.html

This company seems to have tons of interesting coolers and heatsinks. This particular unit is rated for CLU046 but I checked out the properties of that COB and it is same size as the CLU048 so there would also be screwholes ready..

@BigSm0 thanks for those tips man! You happened to post just at the same time as I

 

[BigSm0]

Double check that it's for the clu-048 I didn't see it. That's very similar to what I use

 

[MedGrower]

Double check that it's for the clu-048 I didn't see it. That's very similar to what I use

Naah.. Just checking out the MechaTronix site. Looks way better man.. Thank you

 

[MedGrower]

I think I have found out a good one! That would be ModuLED 9950 Citizen Citiled Star LED Cooler ø99mm (http://www.led-heatsink.com/seepricesandbuy.php?cateid=559)

Weight per unit is 356g so if I have 4 of those they add some 1,4kg of weight and it is still alright.
Thermal resistance Rth 1.34°C/W
Total cooling surface 104563mm²

Those numbers don't tell me much but it sounds to me that the thermal resistance is pretty nice and low. I've seen lower though.

 

[BigSm0]

That's not going to do it. I'd guess they are rated for 30w max. I'll send you a pm with a link.

This is what I run