How to: drive common cathode led with Arduino?

Using Arduino General Electronics
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I will supply each led-pcb with their own controller. What specifications should I go for?

  • 17v - because it have to be more than 15v (can it be much more than 17v)?
  • minimum 5W - because that's what each led-pcb is? (does it matter if it's larger than 5W, as long as it isn't under?)
  • 350mA or more, does it matter if it can deliver lets say 700mA? I guess the led "takes what it needs"

Thank you very much Grumpy_Mike :slight_smile:

Best regards
Joe