Cree CXB3590 vs 315w cmh

[Komplex180]

I'm 3/4 through my first grow, and currently using a Mars 2 400w in conjunction with the mars 300w. I wanted to compare/upgrade the mars set up with either 4 cxb3590, or 315w CMH.

I'm a little on the fence between the two. I've seen some pretty great results with the 315 but a little worried about temps during the summer. I've heard the cob 3590s are awesome too but haven't I can't seem to find results from a 4x 3590 setup.

Btw I'm growing in 2.5x2.5x5.5 tent

Thoughts, opinions, and why, would be a big help.

And of course a photo because I hate looking at a new thread without at least one picture .

Sent from my iPhone using 420 Magazine Mobile App

 

[SunPlix CMH]

315W doesn't give off much heat. There is a thread here: Green Crack & White Cookies - Mainlining Under A Sunplix CMH

 

[Komplex180]

Thanks for the reply and links. I'll check em out


Sent from my iPhone using 420 Magazine

 

[Justwannagrow]

I'm in the same boat as you, it's hard to find someone just using 4 cobs

 

[nobodyhere]

there are several journals including mine where members have just 4 cobs. I started in same tent as yours, 4 citizens, decided to add some red via osrams with 2 more units. I have no doubt in a 5 sq foot tent that 4 cobs would be enough...it's a LOT of light when running at max.

fwiw, I ran a cfl while running cobs just to be safe bc I was worried. Seriously, it's a lot of light.

My temps dropped from running cobs by about 3 degrees when I replaced a '300'w led.

I will also add you gain some headroom in the tent bc your running without a hood. Might save a few pennies in veg if you set up cobs where you can dim them.

 

[Justwannagrow]

Yeah but like you said you added a bunch of stuff, I would like to see what just 4 3500k 90cri vero29s can do

 

[AvidLerner]

I'm 3/4 through my first grow, and currently using a Mars 2 400w in conjunction with the mars 300w. I wanted to compare/upgrade the mars set up with either 4 cxb3590, or 315w CMH.

I'm a little on the fence between the two. I've seen some pretty great results with the 315 but a little worried about temps during the summer. I've heard the cob 3590s are awesome too but haven't I can't seem to find results from a 4x 3590 setup.

Btw I'm growing in 2.5x2.5x5.5 tent

Thoughts, opinions, and why, would be a big help.

And of course a photo because I hate looking at a new thread without at least one picture .

Sent from my iPhone using 420 Magazine Mobile App

I grow in a 2x2x6 with 4-cxb3590 3500k 36v hlg-285h-c2400b mw driver. I have used it for two years and it is great. I used to use a 600w hps in a 3x3 with four plants. I get the same output with the 4 cxbs.
However, I have added additional deep red 1 hour am and far red pm 30 min. for sunrise/sunset effect. I also have a diamond xl 450 and I am using the cxbs for now. Hope that helps.
I am also looking at chilledgrowlights.com with their new kits and low power high production with his Gen2 engine. His Gen1 engine equaled 800w cxb with his 650w

 

[nobodyhere]

Yeah but like you said you added a bunch of stuff, I would like to see what just 4 3500k 90cri vero29s can do

Only thing I added was 2 additional red COBs, totaling 48watts.

I think you could run those vero29 in that small of a tent at about 20% veg and maybe 50% bloom

 

[Justwannagrow]

2400ma and they aren't fried.? Wow

 

[AvidLerner]

2400ma and they aren't fried.? Wow

Typo 1400ma lol damn

 

[Komplex180]

Thanks for all the info on the COBs guys, but I ended up picking up a SunSystem 315w for 300 out the door, couldn't pass it up. However, I am finding that the temps are getting a little too hot for the summer. So I may actually revisit the cobs for this summer

 

[fanleaf]

2400ma and they aren't fried.? Wow

They wont fry with 2400mA as long as heatsink is good. They max at 3600mA.

 

[AvidLerner]

They wont fry with 2400mA as long as heatsink is good. They max at 3600mA.

It was a typo it is 1400ma

 

[fanleaf]

It was a typo it is 1400ma

I understand that it was a typo. Im just saying they can very easily drive at 2400mA if heatsink is good.

 

[AvidLerner]

I understand that it was a typo. Im just saying they can very easily drive at 2400mA if heatsink is good.

That was not the point. The point was using a 3590 36v at 1400mA for 50w is great. Using a 3590 36v at 700mA is even greater. 3.32 micomoles/watt

 

[fanleaf]

That was not the point. The point was using a 3590 36v at 1400mA for 50w is great. Using a 3590 36v at 700mA is even greater. 3.32 micomoles/watt

Thanks Captain Obvious but I understant that too. My point though (which I'm allowed to make also) was to the comment about it blowing up if it were at 2400mA which the chip can handle. .

 

[fanleaf]

Let's just start over Avid lol

 

[Justwannagrow]

I'm just wanting to know can they rock 2100ma and be perfectly fine giving a good heatsink

 

[fanleaf]

I'm just wanting to know can they rock 2100ma and be perfectly fine giving a good heatsink

All day long. In the past I have ran 3590's at 2100mA for 2 whole auto grows at 18/6 light the whole time. Never burned a single chip and still use them today. Good heatsinks and they still stay VERY cool at 2.1 amps.
Just to punish a chip I put it on a homemade active sink and ran it for 6 hours at 3200mA without a hiccup. They are just nowhere near as efficient at 3000mA as they are at 1050mA.
The 3590 is a 137 watt chip. Just multiply volts times amps to get watts. Example is 36v x 2000ma so 36x2.0=72 watts.

 

[Justwannagrow]

Ok that's what I thought but jimmy james made it seem like that was too much, so you think 1050 on 36v is where it's at?