(I believe that inactivity due to source items lacking, low power, and lack of destination space all have the same appearance in just bottleneck lite)
Unfortunately in Lite's they all do have the same shape/icon, but it has enough colors to pick from that you can tell them apart. I have full output set to orange, no input/idle set to red, and no/low power set to purple.
I really wish the power ones could get a unique icon so that i could just use yellow and red for low/no power...but mod author said no.