MCE in parallel

[jbwiden]

I see many people who run the LED's in parallel what concerns me is thermal runaway. I thought LED's have negative temperature coefficients and thus as it heats lowers Vf and draws more current (positive feedback)... Is it not a problem as the LED's are on the same die and they all see the same temperature or some other reason?


What I want to do is run 3 MCE's off of one Hipflex driver from a 13-15 volt source (Automotive 12v when running). What I plan to do is to have each MCE wired in parallel (LED's on each die in parallel) and run the three MCE's in series. So it will be at most ~12 volts at 2.8 amps

Are there any reliability issues with this configuration?


Thanks,
Jbw

 

[yellow]

I was one of the persons to doubt heavily that P7 will survive 1 year of service because of parallel wiring
and was wrong


obviously it is not this "bad",
or the high power leds have much better (and similar) die, than those crappy 5mm in showerheads.

point is: do it, seems not to cause problems