Grandaddy White LED Micro cab

[psyphish]

That's odd. I wouldn't expect them to be wired in a way that could light just half of them if a driver burns up. Do you have a picture of the inside parts and wiring?

Here's one of the four drivers, there's two drivers for each COB.


Both COBs look damaged, I have no idea what has happened to them.

 

[exploziv]

What happened to them is probably they were run at 70-85 W without enaugh heat dissipation. That or crappy leds..
Are the drivers soldered to the chips or you can take out the connector? If you can take it out take them out in turns to see if the leds is lit the same way. If you find out you got 2 working drivers and 2 damaged ones, connect the 2 good ones to same chip and see if it's all good. Then get back to us.

Keep in mind you need to take care of the polarity the red side should always be connected to the red wires and the black one to the black ones. To disconnect a driver you just simply remove it's red wire from the chip.

Even if you get new drivers, those led chips look bad and the whole panel is probably shitty because of bad cooling. Is it fan cooled or passive cooling?

Also, you should probably try to contact the seller of the led with the pics you showed to us and see what do they have to say..

 

[psyphish]

The drivers are soldered to the COBs, I think I'm just going to forget about the whole thing. It wasn't bright enough to justify the heat it put out, the 80w Hans panel that I put in the cab is ridiculously bright compared to it.

 

[Dion]

inseficient cooling melted the surface of the les causing failure(is the cobs skin cracked?)

the good news is each of those drivers will run a cree 3070 very well and you have 4

also after further inspection and a lil maths we might even be able to reuse the heatsinks

 

[psyphish]

inseficient cooling melted the surface of the les causing failure(is the cobs skin cracked?)

the good news is each of those drivers will run a cree 3070 very well and you have 4

also after further inspection and a lil maths we might even be able to reuse the heatsinks

The heatsinks are 9cm wide and 2cm thick, doesn't seem like much. I'd definitely like to build a cree light or two if the parts allow it.

 

[HuffnPufferfish]

def seems like they overheated, get some fresh leds and turn up the cooling and blast off!

 

[grouchy]

I would grab a pair of cxb-3070 and a couple artic alpine 11 plus heatsinks with the fans attached. A couple of those drivers are probably still good and the cxb-3070 runs at 36 volts. The cxa-3070 runs at 38.5 volts and wouldn't work with the drivers but the cxb is better and easily available. You will also need some thermal compound (the lack of even coverage probably fried the old cob) and a couple cheap cob holders to avoid soldering. For approximately $60 per unit you could have some solid 40w units with great efficiency.

 

[Dion]

The heatsinks are 9cm wide and 2cm thick, doesn't seem like much. I'd definitely like to build a cree light or two if the parts allow it.

[URL=http://i.imgur.com/qUoTWqDl.jpg]View Image[/URL]

well seen as each of those chips were being run off 2 drivers it could be enough but id prob save the fans and sinks for another project or for use in another veg light or whatever

I would grab a pair of cxb-3070 and a couple artic alpine 11 plus heatsinks with the fans attached. A couple of those drivers are probably still good and the cxb-3070 runs at 36 volts. The cxa-3070 runs at 38.5 volts and wouldn't work with the drivers but the cxb is better and easily available. You will also need some thermal compound (the lack of even coverage probably fried the old cob) and a couple cheap cob holders to avoid soldering. For approximately $60 per unit you could have some solid 40w units with great efficiency.

actually at 1200mA( the current of those drivers) the cxa3070s pull around 36.5 v and are around 45% efficient

however these drivers will reduce current until the voltage is in range(within limits)

so its likely with these drivers he could run them at 1050mA


howver i agree with grouchy

seen as each driver can run a single cob you should get 3 cxb3070s

you could get 2 300k and 1 6500k
or just 3 3500k
or whatever

that way you will be at around 870ppfd(75x40cm space yeah?)

you should arctics and grease and u are all done(130 euro including cobs)

 

[Sforza]

Here's one of the four drivers, there's two drivers for each COB.
[URL=http://i.imgur.com/rratgI9l.jpg]View Image[/url]

Both COBs look damaged, I have no idea what has happened to them.

[URL=http://i.imgur.com/tbxZB2zl.jpg]View Image[/url] [URL=http://i.imgur.com/MXsibPgl.jpg]View Image[/url]

I had an Apollo fixture with the same set up. One of the COBS burned out but I tested the drivers and they were still putting out the specied current, so I put in a cheap COB from China that I had as an extra and it is working fine now.

 

[Sforza]

The drivers are soldered to the COBs, I think I'm just going to forget about the whole thing. It wasn't bright enough to justify the heat it put out, the 80w Hans panel that I put in the cab is ridiculously bright compared to it.

Mine were soldered onto the COB too, but I just touched the point where they were soldered and the wires came free. Then I just soldered the two driver leads right back onto the COB.

Your best bet would be to get you some CXB3795 COBs and Meanwell drivers from Kingbright and get some really strong light for some great results.

Buy once, cry once! Fool around wasting your time and money on junk will end up costing you more money in the long run than just biting the bullet and getting the good stuff from the get go.

 

[psyphish]

I've updated the journal in the first post.

 

[Dion]

hey how are you?

its been a while