Robert Bruninga via EV wrote:
UPDATE:
For grins, I had the LEDs from a second bulb. It fully illuminated at the
same 80 volts over 14 LEDs at 60 mA, but was 100% linear among the LEDs.
Every one of the LEDs started dim and ramped up linearly and identical to
each other just as one would expect in a series string.
A retest of the original set still showed the totally erratic threshold
effect of each of the LEDs flicking on and off until all were on at the same
80vdc and 60 ma. -still unexplained-
Don't 'cha just love modern "quality control"? :-)
Maybe they got a bag of cheap LEDs with some internal circuit, intended
for car lights, blinkie toys, or as low battery detectors.
--
Problems that go away by themselves will be back with friends.
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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