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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i have a great LED light that really keeps me working through the night. really punches that circadian rhythm in the gut too.
but i got the sudden flicker of death like with the florescents'. Sure enough the LEDs were fine but the driver was near death. So thinking quickly when the driver was cold and working i measured the output in parallel with the LED strip, it was 30-33 volts when steady.
The driver put out 33 volts on the label, and was rated for 10 watts, the whole fixture would get hot too.
NOW, i bought a 34 watt mean well PS. it puts out 33 volts at 1050 mA constant current. it lights up just fine, but the LEDs on the board get hot quick, im not sure if thats normal.
ill post a pic here:
the question: is that 1050 mA CC 3 times the needed current ? (10 watts vs 30 watts.)
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Yes that is too much current LEDs are current driven so you are over doing it by 3X there is little difference in forward voltage drop between 10watts and 30 watts input you need a menawell 10 watt driver
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
LED drivers are designed to put out a fixed, constant current, regardless of the load voltage. This is how LEDs in lamps like to be driven. They generally are not built with current limiting resistors, as these waste power. LED forward voltage doesn't vary much with current (around the normal operating point), conversely applying small change in voltage result in a large change in current (the V/I curve is very steep). The forward voltage does change considerably with temperature though - so for high power LEDs (>0.5W) a constant current supply is used. That way the LEDs wont get overfed, regardless of what their Vf is doing.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Ah sorry, did not read your OP properly. I see you have a CC supply. You can probably mess with it to set the output current to an appropriate value. There will be a feedback resistor somewhere you can swap out for a higher value one - should be fairly obvious as it will be only a few ohms. Switching the output on and off fast will probably make the supply unstable/unpredictable.
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LED light problem, need some input.
