Hello, I am planning to code my own library to create a sort of spectrum analyzer with extra features. I am going to use LED strips to display the data. I was looking at WS2811 or WS2812 strips (30LEDs/meter), because I've used them before, but does anyone know of a cost effective alternative? I really just need them to be addressable w/ no clock pin, and I don't care if it works with Neopixel.
Anyway, My question is regarding power. For a 12-13m strip, it takes more than the Arduino's 500 mA supply as far as amperage. I know the limit as far as processor memory is 500 LED's (~16'), so I know I'm okay in that department, but it looks like 60mA per trio of LEDs, 30 per meter, for 12m is about 7-8A max. Does this sound correct? Additionally, with such power requirements, will I need a MOSFET chip? I've seen others use them, but I'm not sure if I need one.