LEDs not working

[drew2468]

I’m working on making grow lights. I mounted the LEDs to the starboards, checked the LEDs with my multimeter, all good. I mounted the starboards to my panel, tested the LEDs again, all good. I soldered the wires connecting the starboards and tested the connections, all good. I connected the LEDs to my driver, plugged it in, and they all worked. A day later, I plug it in again, and now only four LEDs are working—two on one end and two on the other, all the ones in between are out. I used my multimeter to test all the LEDs with the diode tester and they still work. What am I missing?

LEDs: Forward Current: 350 mA; Forward Voltage: 2.2 V; Power Rating: 2 W. I have 14 LEDs in series. Driver is 350mA constant current 28-100VDC 35 Watt

 

[KlausST]

Hi,

you have 14 LEDs in series ....and only 2+2 work?

Show photos of your wiring. And tell us which is which (input output, cathode, anode,...)
Then we can tell what measurement you should do to debug the circuit.

Best: Use a picture with good resolution, reduce the color qualitiy to get less than 1MB, show them as thumbnail.

Klaus

 

[betwixt]

Also tell us what type the LEDs are. Is 350mA their maximum rating at the surrounding temperature?

Brian.

 

[Audioguru]

The little stars do not provide enough cooling for the LEDs in between the ends when the current is full blast.

 

[MichalP]

You should add resistors to it if you do not want to burn diodes