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Originally Posted by sperry
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.
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If you read that page I linked to, you will see that hooking up LEDS in parallel is not a good option. One with slightly lower internal resistance will take more of the juice, making the others dimmer, and shortening it's life, and when it goes, the rest will be taking more than there share of voltage and you cascade into darkness.