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I would just like to add that LED lights are easily dimmed and nearly everyone has many inside their vehicles which do just that. The instrument lighting and all those lighted switches use LEDs and they can be dimmed. Being diodes, they operate on DC which is pulsed at a rather high frequency, I think around 1500 Hz, so you don't see the flicker. Then the duty cycle is varied by pulse width modulation to adjust the light output. This is the same practice used to control DC motor speed. You can buy kits to build such controllers in hobby shops, especially those catering to robotics hobby followers.