I have bought a few of these LED strips: http://www.dealextreme.com/details.dx/sku.41016
12V/1.8W - each strip has 12 blue 5050 LEDs
I want to use these in an aquarium as a moonlight. To get even lighting, I may use 2 or even 4 strips dimmed down. Now, 1.8 watts at 12V is .15A = 150mA for each strip, right?
What components do I use between the Arduino and these if I want to avoid damaging both parts? I will get a couple of 3021 BuckPucks for some other experiments, but is this "overkill" just to run up to 4 of these strips?
I also have some ULN2003A, can I connect that to PWM and run a constant current source such as http://www.dealextreme.com/details.dx/sku.13557?