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Originally Posted by ShawnS
Thanks Deano
So if I had an unregulated supply going into the controls at 13.7v and used a white led, the resistor value would be 485 ohms?
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It depends on the LED... they do take a specified voltage. You can put them in parrallel to match the car's voltage instead of using resistors... why convert some of the power to heat when you can convert it to more light!
When I did my gauge cluster, I used groups of 6 in parallel to match the battery voltage (I was assuming 12V, and the LEDs were 2V's each). They worked well as far as light output, but didn't look all that good because the light from the LED's was too directional compared to bulbs.