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The brute-force version is to switch the LEDs with power darlingtons, and stick a hefty half-watt ballast resistor on each LED.
A better solution is to use a constant-current regulator. There's a cheap regulator made for HR-16 lighting fixtures, based around the PT4115 chip; you can find those cheap at the discount suppliers: http://dx.com/p/internal-constant-current-source-p...
The cute thing about these is, the PT4115 has a PWM pin (not used in the cheap constant-current drivers). You can solder a whisker to that and you've got your LEDs.
I'd also caution that the Arduino's power supply won't want to do this kind of heavy lifting either.
You will need a driver board for each LED.
Posted:Mar 5, 2014
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