If I understand you correctly, you need to know how to adjust the brightness level of the LEDs? You don't actually adjust LED brightness the same way you adjust a light bulb's brightness (by limiting current). You need to use something called pulse width modulation (PWM) which pulses the LED on and off at different speeds very quickly, creating the illusion of a dimmer LED. http://arduino.cc/en/Tutorial/PWM#.UwOdTvldUlII recommend starting by connecting a single LED to one of your Arduinos which supports PWM natively, and play around with it.
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