Once we had everything setup, which is aided, furthermore, thanks to the included colored setup documents. It was time to test it out. Quickly we noticed that when simply turning the knob on (below 7v), the LED would light up red, and by turning the knob up more, at least to the point that the fans begin to rotate(7v+), the LED will then change to a blue color. The rated 20W that’s available to you should be able to offer up more than enough juice to power at least one fan per channel, if not more.