Lighting DIY Mars to Cree Cob conversion

[Atulip]

Hey @Atulip do you know what the par would be on 5 cxa2530s and what it would be for 4 cxa2530s all are 36v. Im running 1 with 5 and another with 4 for vegging and I have another 1 with 4 cobs to put in for flower. Was just curious what they might compare to.

Depends on the Bins. Easiest way to check is the cree PCT

http://pct.cree.com/dt/index.html

If you have the lumens, divide by the LER for the par watts. Or if you have the lumens/watt, divide by the LER for the efficiency %(then multiply by the watts for par watts).

3000k 80cri is 325 LER, 3000k 90cri is 276 LER. 5000k 70/80 cri is 324/325 LER

So ...

CXA2530 3000k 90 CRI R4, 36.9v @ .7A, 25.8w, 101lm/w / 276 is 36.6% efficient. 2614 lumens / 276 is 9.5 par watts.

CXA2530 3000k 80 CRI T4, 36.9v 2 .7A, 25.8w, 134lm/w / 325 is 41.2% efficient. 3458 lumens / 325 is 10.6 par watts.


So 38-42 par watts per 4 cxa2530, 48-53 par watts for the 5 cxa2530.

Would be about 36% efficient through the leds with cxa2530, about 46% with the cxb2530 and about 56% with cxb3590. That's if they're all top bin too. If those are lower bin cxa2530s they'll be even less efficient.

 

[Baxterwolfe]

Depends on the Bins. Easiest way to check is the cree PCT

http://pct.cree.com/dt/index.html

If you have the lumens, divide by the LER for the par watts. Or if you have the lumens/watt, divide by the LER for the efficiency %(then multiply by the watts for par watts).

3000k 80cri is 325 LER, 3000k 90cri is 276 LER. 5000k 70/80 cri is 324/325 LER

So ...

CXA2530 3000k 90 CRI R4, 36.9v @ .7A, 25.8w, 101lm/w / 276 is 36.6% efficient. 2614 lumens / 276 is 9.5 par watts.

CXA2530 3000k 80 CRI T4, 36.9v 2 .7A, 25.8w, 134lm/w / 325 is 41.2% efficient. 3458 lumens / 325 is 10.6 par watts.


So 38-42 par watts per 4 cxa2530, 48-53 par watts for the 5 cxa2530.

Awesome thanks for the reply @Atulip so i will have about 130 par watts when Im running all 3 lights that should work pretty damn well for my 3x3 area of my 3x4 tent

 

[Baxterwolfe]

Started my journal back up Im going to try and update every couple days here is the link @Dudeski https://www.autoflower.org/threads/baxterwolfes-mixtape-multi-strain-growroom.50620/

 

[Dudeski]

@Atulip , i gotta,ask a stoned question. Black wire goes to positive on the cob right?

 

[BigSm0]

@Atulip , i gotta,ask a stoned question. Black wire goes to positive on the cob right?

No black is negative.

 

[SpaceGhost]

Greetings all, new subscriber here, I stumbled across this thread whilst searching for info on auto flowering cannabis. I found this thread to be quite interesting as I happen to have 2 Mars 100 x 3 lights that i was using to supplement my 400w cmh in a 4 x 4 tent. After only having them for close to a year and only using them for half that time my Mars units are no longer functioning properly and as you all know from experiance, apparently weren't very efficient either. After reading through the entire thread I was hoping that I could get some directions and guidance on how I might maximize these 2 fixtures by converting them over to COB leds. Some of you experienced converters please feel free to chime in with suggestions. Thanks in advance.

 

[Dudeski]

Thanks @BigSm0 !

Spaceghost, conversion isnt difficult. I just finished mine last night night with two cree 3590. This thread has the parts. Gromau videos are a great start. I think the link is here or in rippers first conversion.

My mars 300s actually worked well, maybe not like a top line light but not as expensive either. A great light to learn with

 

[Ripper]

Greetings all, new subscriber here, I stumbled across this thread whilst searching for info on auto flowering cannabis. I found this thread to be quite interesting as I happen to have 2 Mars 100 x 3 lights that i was using to supplement my 400w cmh in a 4 x 4 tent. After only having them for close to a year and only using them for half that time my Mars units are no longer functioning properly and as you all know from experiance, apparently weren't very efficient either. After reading through the entire thread I was hoping that I could get some directions and guidance on how I might maximize these 2 fixtures by converting them over to COB leds. Some of you experienced converters please feel free to chime in with suggestions. Thanks in advance.

It is pretty easy to do you just need the parts I could easily give you step by step instructions

 

[BigSm0]

Greetings all, new subscriber here, I stumbled across this thread whilst searching for info on auto flowering cannabis. I found this thread to be quite interesting as I happen to have 2 Mars 100 x 3 lights that i was using to supplement my 400w cmh in a 4 x 4 tent. After only having them for close to a year and only using them for half that time my Mars units are no longer functioning properly and as you all know from experiance, apparently weren't very efficient either. After reading through the entire thread I was hoping that I could get some directions and guidance on how I might maximize these 2 fixtures by converting them over to COB leds. Some of you experienced converters please feel free to chime in with suggestions. Thanks in advance.

If the Mars aren't functioning it could be a handful of things. First guess would be the cheaper diodes. Can you tell us what the problem with them is? If it's a series of lights it could be a faulty driver which wouldn't be to your benefit if you wanted to covert it. Northern grow lights sells a smaller driver capable of powering 1 36v 3590 for $15 so for 30 bucks you could eliminate a weak link in the Mars panels run 2 cobs and most likely increase the efficiency too.

 

[SpaceGhost]

@BigSm0, @Ripper Yes that what happened with one of the Mars lights, the diodes started to not come on and it was a series of them too and it just kept getting worse and worse. I had theorized that I may have has that particular light hanging to close to the 400w cmh and the xtra heat caused the diodes to fry. The Mars fixtures have 4 drivers inside listed on label as IN: AC100V-240V (48/60HZ) OUT: DC55V-100V(0.55/0.6A), the 3 fans appear to have their on driver. I WAS thinking 4 72v 3590 crees, one for each driver at .55 for...idk 39 watts or so... ??? But that could be costly for a project you know ??? Truthfully I was hoping one of you vets of the rebuilt Mars phenomenon would give me some suggestions as how I could get the maximum out of a minimum budget.