Yet another CXA3070 build...

speyfly

speyfly

Well-Known Member
Hello fellow growers and DIY enthusiast's, another very happy Cree COB grower here. Thanks to this forum and a special thanks to Stephenj37826 for walking me through this build.

I've been using a Platinum P600 LED for my first 3 grows and have been very happy with the results. That said, my biggest mistake was finding this forum and reading about this COB technology and you folks building a modular grow light that can be serviced on-sight (that in it's self makes too much sense). Now I'm about $600 lighter.

Anyway, my biggest weakness is I know nothing about LED's so I bought a cheap 800 watt cob light just to take it apart and see just how it works and having a visual helped me to understand a little about how it works. Some think I wasted my money but you can't put a price on getting an education. I'll replace the COB's once I decide what I want (probably a veg light).

Now that I've had the new light fired up the girls are really like it (vegged under a cfl)

DSC_0081-001.JPG DSC_0081-001.JPG

but the proof will be in the final product.

The lights pulling 315 watts at the wall and the light coverage looks good. The heat sink (12" X 40") is doing a great job but I added a clip on fan at one end to take the hs temp way down. I'm using Kapton tape at this time to secure the cobs and wiring and have not decided if I will tape the hs. Power supply is the MW HLG320H-36A wired in parallel, grow footprint is 3'X5' and I'm running the light without lenses at this time, looking at the coverage I may not add the lenses. I'll have to see how things progress and I'll post updates.

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I let the girls veg way too long so the canopy will be uneven. Right now that light is 18" off the main canopy and about 12" above the monster cola's. Do you guys and gals have a recommendation distance off the canopy?

This forum is awesome and you guys and gals make it so...
 

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speyfly

speyfly

Well-Known Member
bassman999 said:
I was told the 36V version wouldnt work, so I bought the 42V
Did you measure power draw?
I am going to buy that driver if this is legit?
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I have not measured the draw (was going to but forgot to and I taped over the connects. I figured I would do that when I complete the build. That being said I have it wired in parallel. If I were to wire it in series it would require 2 drivers (I think).

I'm hoping Stephen will chime in to clarify this for you/me.
 
bassman999

bassman999

Well-Known Member
speyfly said:
I have not measured the draw (was going to but forgot to and I taped over the connects. I figured I would do that when I complete the build. That being said I have it wired in parallel. If I were to wire it in series it would require 2 drives (I think).

I'm hoping Stephen will chime in to clarify this for you/me.
Click to expand...
I have heard both ways tht it will clamp, and tha it wont.
I have 6 CXA3070 in parallel on a HLG-240H-42B
The A and C models have adjustable Voltage beyond the 36V rating
My 6 in parallel are pulling under 36V at 950Ma.
I think it should work with no problem..
I have been thinking about getting that driver you have and finding another use for or selling my current one
 
bassman999

bassman999

Well-Known Member
speyfly said:
I have not measured the draw (was going to but forgot to and I taped over the connects. I figured I would do that when I complete the build. That being said I have it wired in parallel. If I were to wire it in series it would require 2 drivers (I think).

I'm hoping Stephen will chime in to clarify this for you/me.
Click to expand...
Series wiring would require a constant current driver, the one you have is constant voltage, and yeah it would require 2 as far as I know.
 
speyfly

speyfly

Well-Known Member
Hey bassman999, I went back to the original thread and this is what Stephen posted.

"For that space a perfect combo to me would be 6-8 cxa3070 on hlg320h-36a. That's the perfect amount of light in there. Also check with Jerry on that driver as well. 8 cxa3070 @ 22.50 + 100 for driver and 1 heatsink USA 12" x36" with shipping and discount should be 180 total . Holders are 2.50 a piece. So this setup should get you in there for 500 or so and be kick ass for your space. You'll be running @ 1.125 so pretty soft as well. You should be around 45% efficient and passive cooled. Nice. You may go over budget 20 bucks possibly after shipping from Jerry but that will be an awesome setup."
 
Stephenj37826

Stephenj37826

Well-Known Member
speyfly said:
Hey bassman999, I went back to the original thread and this is what Stephen posted.

"For that space a perfect combo to me would be 6-8 cxa3070 on hlg320h-36a. That's the perfect amount of light in there. Also check with Jerry on that driver as well. 8 cxa3070 @ 22.50 + 100 for driver and 1 heatsink USA 12" x36" with shipping and discount should be 180 total . Holders are 2.50 a piece. So this setup should get you in there for 500 or so and be kick ass for your space. You'll be running @ 1.125 so pretty soft as well. You should be around 45% efficient and passive cooled. Nice. You may go over budget 20 bucks possibly after shipping from Jerry but that will be an awesome setup."
Click to expand...
Hey what's up. I'd say you are in-between 1.050 and 1.125a current. If you would've went with 42 you would've only gotten 950ma tops. As the fixture warms up vf drops current will go up. Those drivers are the only sensible driver that you can run multiple cxa3070 on period. He couldve went and bought separate drivers for more output but it's not needed.
 
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littlejacob

littlejacob

Well-Known Member
Bonjour
I have a little question for you guy...
One of cob benefit is the multiple light sources...so why doing it the hps style...all the cob on a big hs in the middle?
Why don't you spread the light over the room?
4 cob...split the box in 4 and put a cob ar each center...same for 8...!??
I understand that commercial panel can't because of many parameters...but it makes more sens to me to think like this...
Results will tell me if I am right or wrong!
CU
 
bassman999

bassman999

Well-Known Member
Glad to hear that the 36V version ill work well for the CXA3070
Is there a more powerful driver that this one available in 36V?
 
speyfly

speyfly

Well-Known Member
Stephenj37826 said:
Hey what's up. I'd say you are in-between 1.050 and 1.125a current. If you would've went with 42 you would've only gotten 950ma tops. As the fixture warms up vf drops current will go up. Those drivers are the only sensible driver that you can run multiple cxa3070 on period. He couldve went and bought separate drivers for more output but it's not needed.
Click to expand...
All I can say is, the girls are really responding, pistils popping everywhere:clap:
 
speyfly

speyfly

Well-Known Member
bassman999 said:
What size tent are you using?
I saw you mention 2'x4', and also 3'x5' in your other thread.
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I have a 2X4 tent that I use for vegging, drying and quarantine but my grow room is a 7X7 rubbermaid outdoor shed that is insulated with 1 1/2" foil backed insulation. Right now I'm only using a 3x5 area but can grow more if needed. It has a heated cold air intake for those super cold winter days DSC_0044.JPG, variable speed 8" intake fan with temp sensor to come when it get cold outside, a/c for those hot days, humidifier. I thinks it's getting dialed and the plants seem to like it.
 
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bassman999

bassman999

Well-Known Member
speyfly said:
I have a 2X4 tent that I use for vegging, drying and quarantine but my grow room is a 7X7 rubbermaid outdoor shed that is insulated with 1 1/2" foil backed insulation. Right now I'm only using a 3x5 area but can grow more if needed. It has a heated cold air intake for those super cold winter days View attachment 3556807, variable speed 8" intake fan with temp sensor to come when it get cold outside, a/c for those hot days, humidifier. I thinks it's getting dialed and the plants seem to like it.
Click to expand...
Sounds like an awesome setup.
How are you heating the intake air?
 
speyfly

speyfly

Well-Known Member
bassman999 said:
Sounds like an awesome setup.
How are you heating the intake air?
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I have a 1000 watt 5 gal hot water tank that only turns on when it gets real cold. The heat exchanger is an 8" off Ebay for around $50. The rest of the time I use a passive radiant heater just to maintain 75 deg with humidity at 50% to 60%. Pretty simple system, the thermostats are Chinese and cost around $12, install them in a box and wire in the plugin and 110v and your done. Oh! they're in Celsius so you will need to make the conversion. I found these on a beer brewers website.

STC-1000 digital thermostat- http://www.ebay.com/itm/like/271667255831?ul_noapp=true&chn=ps&lpid=82
 
bassman999

bassman999

Well-Known Member
Stephenj37826 said:
Hlg600h-36a.......
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I saw that one, was hoping thee was one in between the 320 and the 60.
Thats a big jump!
How much efficiency is lost from dimming?
Also is the internal dimming (A) the same efficiency loss as the (B) version when dimmed?
And finally is the efficiency greater more the more it is dimmed?
 
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