"10 watt" LED
A while ago, as an experiment, I bought a 12v outdoor landscape light that claimed 10w warm white. TO NO one's surprise it did not consume 10 watts, and while it did respond to a PWM LED dimmer, th...
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"And furthermore (Jacques Clouseau :)"
May I suggest bench testing samples using a precision power supply?
The 10 watt chips are The Wild West. Take 2 different samples DUT
Apply threshold voltage to illuminate: Note value.
Apply each to a given heat sink...
Note Delta T at recommended drive current...
...then back off the high temp DUT to = temp of the lower chip
Does the illumination seem to be the same?
This exposes (strengths - weakness) in manufacturing techniques
May I suggest bench testing samples using a precision power supply?
The 10 watt chips are The Wild West. Take 2 different samples DUT
Apply threshold voltage to illuminate: Note value.
Apply each to a given heat sink...
Note Delta T at recommended drive current...
...then back off the high temp DUT to = temp of the lower chip
Does the illumination seem to be the same?
This exposes (strengths - weakness) in manufacturing techniques
