Cob light setup check

Can someone critique my potential light setup, small grow room 20x36, only growing 1-2 plants at a time. I understand these 50v cobs are pretty powerful and have seen some other crazy results with only 50w-100w per plant


2 × ideal holder CLU048

2 × artic thermal pads

2 x 133mm passive heatsink

1 x hlg 120h-48A

2 × CLU048-1818

SpencerB said:

Can someone critique my potential light setup, small grow room 20x36, only growing 1-2 plants at a time. I understand these 50v cobs are pretty powerful and have seen some other crazy results with only 50w-100w per plant


2 × ideal holder CLU048

2 × artic thermal pads

2 x 133mm passive heatsink

1 x hlg 120h-48A

2 × CLU048-1818

Click to expand...

Hi spence, without spending hours looking up each of your components it is impossible to asses if they are appropriate, if you could get the spec's from their spec sheets or post links to same, i'll gladly look over your selection. Your 20 x 36 space will be approx 5 sq ft so you will want to aim for between 30 and 50w per sq ft meaning you will need a minimum of 150w and a max of around 300w but I find 30w per sq ft more than adequate and 50w sq ft tends to bleach the plant tops, it depends on your ceiling height. Lastly, I would opt for thermal paste rather than pads, a little more fiddly but a better product.

My fault, I though these were fairly common parts

The driver is rated current: 2.5A Max current: 2.95A can power the following combination of COBs

2 1818@ 78.5W each (157W max)

The 1818 COBs are what I have listed, they are 52 volts with 2.5 amps comes to 65 watts each

Based on my research this will do well for 1-2 plants at a time, but before I pull the trigger I was looking for experienced confirmation. Thanks for your help

SpencerB said:

My fault, I though these were fairly common parts

The driver is rated current: 2.5A Max current: 2.95A can power the following combination of COBs

2 1818@ 78.5W each (157W max)

The 1818 COBs are what I have listed, they are 52 volts with 2.5 amps comes to 65 watts each

Based on my research this will do well for 1-2 plants at a time, but before I pull the trigger I was looking for experienced confirmation. Thanks for your help

Click to expand...

if this is your driver; https://www.mouser.co.uk/ProductDetail/Mean-Well/HLG-120H-48A/?qs=3IPTn0w/0t9sUftTDRPlEQ==
It outputs 120w total also if your cob's are 50v they will probably work at 48v but its advisable to get slightly higher voltage than rated as long as your driver is 'constant current' and that current doesn't exceed your cobs ratings.

That driver is not constant current at least not if I'm reading it correctly. Thanks or your help

SpencerB said:

That driver is not constant current at least not if I'm reading it correctly. Thanks or your help

Click to expand...

Its both cc +cv .

Still learning about cc vs cv myself but the list looks spot on to me .The 48v is better than the 54v. As it tops out at 53v and provides more current.

I'm also learning, if it's cc+cv how is it dimable? I thought it was cv, which means lights would be wired in parallel and then the current was variable

SpencerB said:

I'm also learning, if it's cc+cv how is it dimable? I thought it was cv, which means lights would be wired in parallel and then the current was variable

Click to expand...

The A version have both a voltage and current pot so dimmable via currrent
Output voltage 48V DC, 43...53V DC
Output current 1.2...2.5A

Each cob would take 0.6 -1.25a wired in parallel .

Page 4 in the data sheet gives the cc& cv info.

https://www.tme.eu/gb/Document/1f21d23671f081621d32fd8163a7c498/HLG-120H-SPEC.PDF

Constant voltage is very new to me but really does seem the best way to go with 50v chips..lots to learn

Thanks I appreciate the help, I think this is the setup I'm going to go with

I based it off bob142g 2 autocob grow