Need Help with DIY CXB3590/HLG-185-1400B (4 COB)

I hate to ask for help on my first post but here I am. I have 2 sets of 4 CXB3590s driven each by an HLG-185-1400B. They are mounted 4x4 in a rectangle with the drivers mounted in-between, all on 3/4"x3/4" angled aluminum.

The problem I am running into is this: One set of COBs is shutting off on it's own, around 1 hour into running and then turns on/off at sporadic intervals. I believe it to be the driver as I went ahead and ran the other bank of lights with the same driver and they too turned off.

What would cause this? Poor soldering? I have soldered the pot (tested, working), the +/- COB drives and the power cord is crimped/screw-tightened. Any feedback/assistance toward a solution is appreciated.

Reassess all of your connections. Test driver. Test anything the light is plugged in to.

Thanks for the reply BM9. I have ruled out the connections between COBs as the same thing is happening to both sets of 4 only when connected to the one driver. Isn't the power source either since it works fine with the other driver. I guess my question is more around whether the driver is faulty or if I could have a bad connection. If it is a bad connection though I am not sure why it only surfaces after it gets warm (approx. 1 hour of run time). Admittedly I am not very well versed in electricity. For some reason it is one of the few concepts that I just can't seem to wrap my head around.

Grower_not_Show-er said:

Thanks for the reply BM9. I have ruled out the connections between COBs as the same thing is happening to both sets of 4 only when connected to the one driver. Isn't the power source either since it works fine with the other driver. I guess my question is more around whether the driver is faulty or if I could have a bad connection. If it is a bad connection though I am not sure why it only surfaces after it gets warm (approx. 1 hour of run time). Admittedly I am not very well versed in electricity. For some reason it is one of the few concepts that I just can't seem to wrap my head around.

Click to expand...

Resistance changes with heat. The connection heats up and the metal expands when it's warm.

sounds to me you have a bad driver. If you change drivers and the problems moves, it is not components or connections, but the driver itself. internal failure of a component that returns to service after it cools off.

@_Mango_ @VegasWinner
Thanks for the input. From everything it sounds like I should redo all my connections, retest and return if still having issues. Sounds like I have a little more work to do. Thanks all, happy 2017 and happy growing.