“Each individual NeoPixel draws up to 60 milliamps at maximum brightness white (red + green + blue)” (source). With 30 leds per meter, you’ll need to provide 30 * 0.060 = 1.8A, so 2A is close enough.
However, it seems that may be based on old(er) information. I just tested with a NeoPixel strip that has 41 LED’s, and it’s taking about 0.5A at full brightness white, so 12mA per LED.
