Can I just swap the old cob out?

NeWcS

NeWcS

Well-Known Member
So one of the COB chips in a light I have has gone bad. Can I just swap it out with any 100w cob meant for the same purpose?(ovs that's what the original is).
Thank you
 
Best would be you take a multimeter and check the open circuit voltage and current of the driver. The other way would be to figure out vf and current of one of the still running COB's and get something with identical numbers. But you still need a multimeter to figure it out.
Is it a one COB per driver layout? Why not changing all the COB's against a few better ones? 32x 3w sounds like some of these mixed Epistar COB's with different colours in one chip. They are anyway crap! 25% efficiency, in the best case 30%...
You could use white "full spectrum" COB's like Luminous CXM22(50v, 19$) or Citizen CLU048-1212c4 gen.6(36v, 11$). 50-55% efficiency means twice as much light AND possible yield!
You only need to know forward voltage and current of these drivers and choose the COB's accordingly.
Most of the time they use 600mA drivers in such cheap blurple lights but we need at least a few pictures, the brand and
pics from the internal structures to say more.
 
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The only way to wire different colored diodes in one chip would be series wiring because each color has a different vf. Most of the diodes are red and deep and maybe a few far-red, the rest is blue, white and maybe UVA. I would assuming something between 65 and 75v. At ~600mA this would be 35-45w for one COB.
How much of these COB's have your light and what is the true total power consumption at the wall?
 
NeWcS said:
Its a 32x3w chip. The driver I think says: hp060a. What else would you need to know?
Click to expand...

I don’t know for sure
But 32 x 3 watts sounds like a led panel and not a cob.
If it’s a panel, yes the individual leds can be replaced with some effort.
You can also canibilize the light to put together a cob unit.
But if just one 3 watt led is out
Just go with it and explore newer tech
 
This seems out of my league. lol. Its just a Chinese made 2 x 100w COBs. These type cobs:
JMI1Kbe.jpg


In the past, I just reached out to the company and they sent me a new one, as this has happened before. But was wanting to swap it out for a more 'daylight' colored light. The light is an "HYG03-2*100W-W" if that helps anyone figure it out easier.
Thanks for the help and input...
 
NeWcS said:
This seems out of my league. lol. Its just a Chinese made 2 x 100w COBs. These type cobs:
JMI1Kbe.jpg


In the past, I just reached out to the company and they sent me a new one, as this has happened before. But was wanting to swap it out for a more 'daylight' colored light. The light is an "HYG03-2*100W-W" if that helps anyone figure it out easier.
Thanks for the help and input...
Click to expand...

That's the COB's meant. They run at ~70v max. but they are also available with 35v.(shit)
That means you can swap them against 2 Bridgelux Vero29c's or 29d's which are 68v and 35v COB's. Cree also have CXB's in 36 and 72v. You would get almost the same total wall watts but much better effiency. At least twice as much light.
If you still have contact to the company you could ask them about the COB's voltage and driver current. The best thing still is you borrow a multimeter for the measurements or ask someone else to measure the open circuit voltage and current of the driver or throw the lamp in the car and drive to the next electrician.

BTW,
you can also translate chinese, lol! Install google translator, take a shot from the txt you like to translate, choose all text and press translate. Pretty easy..
 
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NeWcS said:
Does this help? Based on what you said I would guess its the ~70v
YNNivU5.jpg
Click to expand...

Lol! That's all we need! Output voltage range is 70-85v and output current is 520mA, that's 45w drivers and the COB's run probably around 40w at the wall, incl. driver loss this 2x 100w light has only 96w at the wall.
I would use 4 Citizen CLU048-1212 in 3000, 3500 or 4000k and connect two of them in series to the drivers. Would be ~70v or 40w per driver. You can also use two 1212's and two 1812's, in this case you need to connect one 1212 and one 1812 in series. The 1812 will be brighter but that's the only way to max out the driver.

In case the fixture has some fancy refectors and it's impossible to used two chips per driver you could use the earlier mentioned COB's. Bridgelux Vero29c or Cree CXB3590 in 72v should work but vf could be too low because at only 520mA they need less than 70volts. Are the reflectors removable and what typ of heatsink is used?
 
I like to use 3000°k/CRI90 as all in one grow spectrum but you can also use 3500 and 4000°k. You could take the 1812's in 3000°k/CRI90 and the 1212's in 4000°k/CRI80 and use a mixed spectrum with slightly more blue.
Cobkits is probably the cheapest source for these Citizen COB's if you are located in the US. In europe I would take a 5pack 1212's from e3ay(estonia) or from tme.eu.
 
@NeWcS
Reflectors..., shit! I'm assuming there are star heatsinks with only enough surface for one COB? In this case Vero29c or CXB3590 in 72v would be the best bet. But they are not so cheap like the Citizen/Luminous COB's. Maybe 33$ each..

You could remove the reflectors and mount a copper or alu plate/block on each heatsink. This way you could increase the mounting surface up to the outer diameter of the reflectors. That's probably enough area to mount up to 4 COB's.

You really don't need reflectors inside a tent! They use them only to get higher center PAR readings but no one needs a center hotspot and dark corners. Bare COB's have 115-120° and cover the area below much better.
 
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