Need help selecting driver/advice

[GrayDizzle]

I'm not too well versed in LED's just yet, but I am planning a small build and wanted to get some advice..

The plan is to make 2 identical "fixtures", using 3 COBs per fixture, using

2x CITIZEN CLU048-1212 90cri 3000k
1x CITIZEN CLU048-1212 80cri 4000k

Efficiency is not more important than output, but a little bit of both would be nice.

Thanks in advance!

 

[Chip Green]

Without knowing at all how much you know about driver/cob matching, ill take a stab.....
The CLU048 1212 data sheet shows a max voltage of 37.5 for that COB - youll need to triple that number for the drivers voltage maximum, to light 3 of those cobs, wired in series. SO 112.5 forward volts,needed for each 3 COB fixture.
This is where it gets tricky with drivers, fitting the desired drive current into the voltage maximum. The MeanWell HLG series, of constant current drivers has a 150 watt version, the HLG-120H-C1050 has 148 volts available, would run each COB at 1050ma.... The 1400ma version (HLG-120H-C1400) has 108 volts available, not enough forward voltage (at least on paper)

Also I'm not very familiar with CLU cobs, that's the first time ive looked at their data sheets, so if anybody sees an error here, chime in......

 

[sunny747]

I'm not the best at this either so I always just look at what others have used.. Notice on Timber they pair the CLU0481212's with the HLG-185H-C1400B. They use this same driver for the 2 and 4 cob setup so by my estimate it should work fine with 3 and you could always add a 4th very easily to each rig.
http://timbergrowlights.com/100-watt-citizen-clu048-2-cob-grow-light-kit/

Each light will draw approximately 150 watts so you should be good to light a 3x3 pretty well.

 

[GrayDizzle]

max voltage of 37.5 for that COB - youll need to triple that number for the drivers voltage maximum, to light 3 of those cobs, wired in series. SO 112.5 forward volts,needed for each 3 COB fixture.
This is where it gets tricky with drivers, fitting the desired drive current into the voltage maximum. The MeanWell HLG series, of constant current drivers has a 150 watt version, the HLG-120H-C1050 has 148 volts available, would run each COB at 1050ma....

This helped me. I had kind of a basic (limited) understanding of that, but I kinda see how it works now..
I'll keep considering the final version and come back later to get final advice/opinions.
Thank you much!

 

[sunny747]

Some quick math and data outlining the critical calculations.. When in doubt just look at what Timber does ... CobKits, a great member on here may have the cobs and other items in stock..

Volts x Amps = Watts..
Each chip needs 37.5 volts to fire.
The amps of the driver are 1.4
1.4 x 37.5 = 52.5 watts per lite
52.5 x 3 = 157.5 watts of output of light. give or take a few watts..
We are assuming that you are wiring in series which is the most common way.
You definitely want the dimmer.

 

[GrayDizzle]

Some quick math and data outlining the critical calculations.
Volts x Amps = Watts..
Each chip needs 37.5 volts to fire.
The amps of the driver are 1.4
1.4 x 37.5 = 52.5 watts per lite
52.5 x 3 = 157.5 watts of output of light. give or take a few watts..
We are assuming that you are wiring in series which is the most common way.
You definitely want the dimmer.

Thanks for helping me learn how to figure it out in the future vs just giving me an answer so I can continue to be uneducated in the matter.

CobKits, a great member on here may have the cobs and other items in stock.

Definitely plan to order from him.. just seeing him on here presenting himself as knowledgeable, with professionalism and courtesy (even in a thread I saw full of negativity) goes a long way with me. Not to mention probably the best prices I've seen so far on almost every component I'm needing.