[Help] - How many COBS CXB3590's are advised and more efficient for a 2x2 space?

[poxa]

Hi all,

please, noob here: I would like to build a single rail made by a dimmable series of CXB3590, 36v or 72v, an ideal 2x2x5 space, AC power 220v.

I'm asking your advice to clearly understand how many CXB9530 are advised, and I still don't know if it's better go with 36v or 72v. I'm simply looking for good efficiency, maybe using a suitable PM dimmable driver for the purpose.

Greatly ignorant about the subject, I hope you understand.

Thanks guys...

 

[Actionbone]

U can go with 2 at 75w each 49% efficiency 3 at 48,8w - 56.3% efficiency, I'll go with 2 and you almost max the intensity 940-950 ppfd 1050ppfd for the 56.3%, go with the 72v for 2, and 36v for 3

 

[bicit]

I'd say four 23w emitters would be about ideal. ~800umol/s/m^2, over 60% efficiency, minimal heat sink required. Run four 36v emitters on an HLG-80H-C700. (alternatively you can use 72v emitters with the HLG-80H-C350A, same result) Get a 12-18" long piece of the 12" profile from heatsink usa, four of 50-2303CR cob holders, arctic silver 5, and kapton tape. Run the heatsink passively to skip needing a fan.

Simple and effective.

 

[poxa]

Great folks! I can't say enough thanks for your help! It's very hard to choose from this pit of ignorance where I am, and still difficult to understand pro/cons of configurations, BTW:

I'd say four 23w emitters would be about ideal. ~800umol/s/m^2, over 60% efficiency, minimal heat sink required. Run four 36v emitters on an HLG-80H-C700. (alternatively you can use 72v emitters with the HLG-80H-C350A, same result) Get a 12-18" long piece of the 12" profile from heatsink usa, four of 50-2303CR cob holders, arctic silver 5, and kapton tape. Run the heatsink passively to skip needing a fan.
Simple and effective.

@bicit, I like also this 23w x 4 so much, great efficiency. For dimming I would choose then a xxx-xxx-xxxxB version of the drivers you mentioned above.
I must ask this stupid question, pardon: if we have same results with 32v and 72v, what is the reason behind that makes to choose one voltage rather than the other?
And if heat sinker is required, may a 2x2 1.2mm thin copper sheet be usable in some form? Using active cooling in this case...

 

[bicit]

@bicit, I like also this 23w x 4 so much, great efficiency and a bit inspiring. For dimming I will choose then a xxx-xxx-xxxxB version of the drivers mentioned above.
I must ask this stupid question, pardon: if we have same results with 32v and 72v, what is the reason to choose one rather than the other?
And If minimal heat sinker is required, I have a 2x2 1.2mm thin unused copper sheet already at home, may it be usable in some form in this project, in substitution of the heatsink usa? If needed, I'm open to active cooling in this case...


And finally, where could I find a well known product code that people here usually use that refers exactly to a CBX3950 CD bin?

Get the A version. It is dimmed via an internal pot, no need for external equipment.

36v vs 72v is arbitrary really. About the only difference is that the driver can be mounted further away from the lamp with the higher voltage emitters. Higher voltage lines are also considered higher risk.

No that copper plate won't work. If you're in the EU there are better options for heatsinks. CPU coolers worked very well.

 

[poxa]

Get the A version. It is dimmed via an internal pot, no need for external equipment. 36v vs 72v is arbitrary really. About the only difference is that the driver can be mounted further away from the lamp with the higher voltage emitters. Higher voltage lines are also considered higher risk.

Good notes for me bicit, thanks again for your patience. It will be A driver then, less fuss and wiring.

No that copper plate won't work. If you're in the EU there are better options for heatsinks. CPU coolers worked very well.

What's the maximum cables length allowed by 72v and 36v?

 

[poxa]

U can go with 2 at 75w each 49% efficiency 3 at 48,8w - 56.3% efficiency, I'll go with 2 and you almost max the intensity 940-950 ppfd 1050ppfd for the 56.3%, go with the 72v for 2, and 36v for 3

Your advice about (2x 75w each 49% efficiency) and still better (3 at 48,8w - 56.3% efficiency) is very tempting, initial expense could be more cheaper and seems now to me could be also a good midway.

Please, could you tell me the driver (72v and 32v) that must be used for 3x48.8w and 2x75w?

 

[Actionbone]

Your advice about (2x 75w each 49% efficiency) and still better (3 at 48,8w - 56.3% efficiency) is very tempting, initial expense could be more cheaper and seems now to me could be also a good midway.

Please, could you tell me the driver (72v and 32v) that must be used for 3x48.8w and 2x75w?

Well if you want efficiency go for 4 cobs like bicit say, but remember it's only 50w more consumption and about 15% more intensity also cheap and easy.

Drivers

HLG-120H-C1050A for 2 72v cobs
HLG-120h-C700a for 3 72v cobs

 

[poxa]

Well if you want efficiency go for 4 cobs like bicit say, but remember it's only 50w more consumption and about 15% more intensity also cheap and easy.

Thanks again, saved for future reference...

2x2x5 - 2'x2'x5' - How many cobs and drivers, efficiency (1000umol/s/m^2 max)

4 cobs - Efficiency 64%, about ideal, 800umol/s/m^2
(4 x 23W) HLG-80H-C350A with 4 x 72v cobs
or (4 x 23W) HLG-80H-C700 with 4 x 36v cobs

3 cobs - Efficiency 56.3%, 1050umol/s/m^2
(3 x 48.8W) HLG-120H-C700A with 3 x 36v cobs

2 cobs - Efficiency 49%, 960umol/s/m^2
(2 x 75w) HLG-120H-C1050A with 2 72v cobs

[UPDATED #10]

 

[Actionbone]

64% efficiency, not 60 and like 1050 umols for the 56.3 option and 960 for the 49%, think also 1000 umols max and I like the idea of max a small space.

 

[Actionbone]

Thanks again, saved for future reference...

2x2x5 - 2'x2'x5' - How many cobs and drivers, efficiency (1000umol/s/m^2 max)

4 cobs - Efficiency 64%, about ideal, 800umol/s/m^2
(4 x 23W) HLG-80H-C350A with 4 x 72v cobs
or (4 x 23W) HLG-80H-C700 with 4 x 36v cobs

3 cobs - Efficiency 56.3%, 1050umol/s/m^2
(3 x 48.8W) HLG-120H-C700A with 3 x 36v cobs

2 cobs - Efficiency 49%, 960umol/s/m^2
(2 x 75w) HLG-120H-C1050A with 2 72v cobs

[UPDATED #10]

For 3 cobs you must use 1400ma model for 36v cobs or 72v and 700ma

 

[bicit]

http://www.calculator.net/voltage-drop-calculator.html

 

[Randomblame]

Hey Poxa!
You can also use 4 CXB3590/CD bin/36v with a HLG-120H-C1050 = Ø60% eff.,
35,5w each cob, thats 142w, 85,2PAR/w and you'll get Ø 1100μMol/s on a 60x 60cm area.
A Ø 9000cm² heatsink can spread the 56,8w of heat easily and you do not need any fans.
Total consuption 142w : 94% driver efficiency = 151,1w!!

 

[poxa]

For 3 cobs you must use 1400ma model for 36v cobs or 72v and 700ma

Ok thanks, can't edit back, hope I wrote correctly:
3 cobs - Efficiency 56.3%, 1050umol/s/m^2
(3 x 48.8W) HLG-120H-C700A with 3 x 72v cobs
(3 x 48.8W) HLG-120H-C1400A with 3 x 36v cobs

http://www.calculator.net/voltage-drop-calculator.html

Nice gift, thanks!

Hey Poxa!
You can also use 4 CXB3590/CD bin/36v with a HLG-120H-C1050 = Ø60% eff.,
35,5w each cob, thats 142w, 85,2PAR/w and you'll get Ø 1100μMol/s on a 60x 60cm area.
A Ø 9000cm² heatsink can spread the 56,8w of heat easily and you do not need any fans.
Total consuption 142w : 94% driver efficiency = 151,1w!!

Hi Randomblame!, liked very much this, thanks to you too! Helped so much!

 

[ttystikk]

Hey Poxa!
You can also use 4 CXB3590/CD bin/36v with a HLG-120H-C1050 = Ø60% eff.,
35,5w each cob, thats 142w, 85,2PAR/w and you'll get Ø 1100μMol/s on a 60x 60cm area.
A Ø 9000cm² heatsink can spread the 56,8w of heat easily and you do not need any fans.
Total consuption 142w : 94% driver efficiency = 151,1w!!

How much does this option cost?

 

[Randomblame]

How much does this option cost?

Hey ttystikk!
Is not so expensive!
200$ for 4x CXB35903.500k/CD bin
60$ for the Meanwell HLG-120H-C1050(B) and
50-70$ for the heatsink(I got 4 heatsinks, each with 7160cm² for 140$ from ebay)
Thats 310-330$US for a 60% eff. lamp with 151w and Ø400μMol/s/m2.

I see in your signature that you are working vertically. A great way to cool Cobs vertically is using a 100x 100mm aluminum tube with 5mm thickness. Inside covered with 2mm thick C-channels in the same length to increase the cooling surface and at the end of the tube direct air extraction like a cooltube. A 1m long tube should be enough for up to 8 CXB3590 @ 1050mA well cooled, but they require active ventilation!

 

[HydroNerd]

Hey Poxa!
You can also use 4 CXB3590/CD bin/36v with a HLG-120H-C1050 = Ø60% eff.,
35,5w each cob, thats 142w, 85,2PAR/w and you'll get Ø 1100μMol/s on a 60x 60cm area.
A Ø 9000cm² heatsink can spread the 56,8w of heat easily and you do not need any fans.
Total consuption 142w : 94% driver efficiency = 151,1w!!

Thanks, I just ordered the exact setup for my 2x2 grow tent.
I've also added a second panel for my seedling chamber which is 1x2 with 3 CXB3590/CD bin/36v and a HLG-60H-C700 driver.

Cheers

 

[VegasWinner]

For a 2x2x5 for cloning and light vegging, I am running 2-cxa3590 36v, 5000k and 2-cxb3590 36v, 3500k, mounted on 2 5.88" x 18" heat sinks passive cooled with a fan mounted, for S&G, running on a single HLG-80H-C350A for great veg capacity. for more serious vegging I use 4-CXA3590, 72v, 5000k, 80 cri, active cooled mounted on 2- 5.88"x18" heat sinks, running on an HLG-185H-C700B for a total of 200watts. love both lights . peace

 

[Snaddehat]

Hiya OP
Just thought i would chime in here... I have the exact same space as you and i use 4 CXB3590 36v 3000k 80 CRI. Each COB is driven at ~50w on seperate cheap ass drivers (87% efficient and non-dimmable).
I was worried that the intensity might be too much, but i have completed 1 grow now with this setup(seed to harvest) , and the plants responded well. No issues with bleaching or the likes... Oh, and i had my light at ~50-60cm from canopy.
However, when i get the chance to change my setup, i will definitely see if i can run these 4 COB's on a Meanwell HLG ? 1050 A/B. I think someone suggested this setup earlier... 35ish watts x 4 at ~55-60% efficiency is more than plenty for that space.

Anyways, you're definitely on the right track

Good luck and happy growing with whatever setup you choose

 

[VegasWinner]

Hiya OP
Just thought i would chime in here... I have the exact same space as you and i use 4 CXB3590 36v 3000k 80 CRI. Each COB is driven at ~50w on seperate cheap ass drivers (87% efficient and non-dimmable).
I was worried that the intensity might be too much, but i have completed 1 grow now with this setup(seed to harvest) , and the plants responded well. No issues with bleaching or the likes... Oh, and i had my light at ~50-60cm from canopy.
However, when i get the chance to change my setup, i will definitely see if i can run these 4 COB's on a Meanwell HLG ? 1050 A/B. I think someone suggested this setup earlier... 35ish watts x 4 at ~55-60% efficiency is more than plenty for that space.

Anyways, you're definitely on the right track

Good luck and happy growing with whatever setup you choose

If you run them on a C1400B you will get the same output and dimmable. I have a couple of those 50w as well and I use the C1400B more. Peace