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Old 03-06-2015, 12:26 PM   #21
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The up/down controller will use a PWM (pulse width modulation) to adjust the brightness of the LED's. Using a potentiometer will only work on dumb led's. If the led has a constant current source built in then the brightness will not change till you drop the voltage very low.
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Old 03-06-2015, 12:27 PM   #22
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Ah, ok, voltage regulator, I thought you were working with a dc/dc converter. Maybe all you need to do is wire in a bypass switch so if your battery voltage gets too low for the regulator you can apply full available voltage to the lights.
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Old 03-06-2015, 12:32 PM   #23
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Quote:
Originally Posted by Happy Vibe View Post
The up/down controller will use a PWM (pulse width modulation) to adjust the brightness of the LED's. Using a potentiometer will only work on dumb led's. If the led has a constant current source built in then the brightness will not change till you drop the voltage very low.
All of the dc led replacement lights I've seen are "dumb", just groups of component leds in series and parallel groupings on the board to get them to the right voltage. Downside is when one component led goes then the whole group goes and you get a dead spot.
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Old 03-06-2015, 12:35 PM   #24
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It is the same with the constant current ones. They put the led's in series and if you lose one you lose the whole string.
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