Chinese cob remake.

ZootAllure

ZootAllure

Member
I have 2 chinese "1800w" cob lights. I want to cannibalize and rebuild on 2 3x2 aluminum sheets. Lights use individual ll2250pf 50w constant current drivers. The drivers spec is 87% eff. Is there any reason other than dimming to change them...if so any suggestions? Any idea what kind of cobs these are, the only marking is JCXGD on the face. Each Light pulls 325w at wall so its a solid 50w per cob. 600w for $240 is hard to pass up and I think spreading them in my 5x7 area will help hotspots and led cooling. The back of each fixture will have heatsink and 120mm fan. Thanks
 

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Airwalker16

Airwalker16

Well-Known Member
Yup, they're 24-36v with 1.5a current. Citizen clu048-1212/1812, Cree cxb3590/3070, or Vero29C will all work with it and produce 50-60 watts per. Reuse the drivers, NOT the COBs.
ZootAllure said:
I have 2 chinese "1800w" cob lights. I want to cannibalize and rebuild on 2 3x2 aluminum sheets. Lights use individual ll2250pf 50w constant current drivers. The drivers spec is 87% eff. Is there any reason other than dimming to change them...if so any suggestions? Any idea what kind of cobs these are, the only marking is JCXGD on the face. Each Light pulls 325w at wall so its a solid 50w per cob. 600w for $240 is hard to pass up and I think spreading them in my 5x7 area will help hotspots and led cooling. The back of each fixture will have heatsink and 120mm fan. Thanks
Click to expand...
 
D

devile

Member
The light draw 325W, why it called 1800W COB light, it is very fake advertising. I am using Mars COB 105W draw power to grow one plant
 
Moflow

Moflow

Well-Known Member
Your heatsinks - 2 off - 3 ft x 2 ft x ? How thick is the aluminium?
I like the citizen 1212s, 2 per driver at 25 watts each, wired in parallel.
Good efficiency and at a tenner each as cheap as chips.....
Or, as @Airwalker16 suggested you can use the other cobs.
Or a QB288 will run soft on those drivers.
Lots of options. :bigjoint:
 
swedsteven

swedsteven

Well-Known Member
15387526399301433919186823385394.jpg 15387526721111725627252527646561.jpg Haha the driver are not good im thinking on buying a meanwell 300watts i already hack the same light 2. 1212 3000k 90cri
More like 1 1/4'×3/4'
Fan for colling on top
I want to try put 12 cob on one fixture so I could pull more umol 2 cob per 50 watts driver will it work
Or only the 2 middle one

Have a project for today eont start in paralle
 
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ZootAllure

ZootAllure

Member
Sadly my budget doesnt include new cob's just yet. My 1st goal is to spread the cobs to better cover the area and decrease the temp they are running at. The aluminum plate will be ~.025 3x2 with aluminum angle reinforcement. I have a bunch of those round CPU heatsinks that I will thermal glue to alum sheet above the cobs w/ 120mm fan. Hopefully someone will be able to identify the cobs as I'm not convinced they are that bad by the results Ive achieved so far. Thanks all
 
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1212ham

Well-Known Member
Spreading the cobs out is good, but .025" thick sheet is very thin, won't conduct much heat. One of those heat sinks and fans on each cob should be good.
The cobs @Moflow and (Airwalker) mentioned are Citizen clu048-1212. With two on each driver, they share the current and would run at 25w each.
http://cobkits.com/product/citizen-clu048-1212-80cri-gen6/

Another option would be Samsung F-series strips. With the light and heat well distributed, they are easy to cool. Maybe one or two 580mm strips per driver? I have a couple of the small, cheap CC drivers.... maybe I'll dig them out and test with Bridgelux strips.
http://ledgardener.com/diy-led-strip-build-designs-samsung-bridgelux
 
swedsteven

swedsteven

Well-Known Member
I got 16 50 watts 24-36volt spare driver humm strip strip strip wich one !!!
 
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1212ham

Well-Known Member
36 volt strips, if they exist. The 580mm Bridgelux EB Gen-2 strips are 700ma at 19.5v. Using two strips in parallel, I tested two cheap 36v drivers.

The first driver is 22-38v, 1350ma and pulled 28 watts from the wall.
Second driver is 22-36v, 1500ma and drew 22 watts.

Samsung F-Series strips are 23v, should draw about five more watts.
 
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