By visible, you mean the cables “glow”? The entire cable is visible? or just the ring around the port? I’ve never seen the entire cable glow, just the ports. A screen shot of glowing cables would be cool to see.
I have seen Glue labels glow in the dark using Fungi Lights Out, which I reported at GLUE: Glow in the dark labels! If a new patch contains Glue and Lights Out, and the very first label is over a glowing LED, then all labels glow in the dark. If the first label is not over a glowing LED, then none of the labels glow.
It will be interesting to see how things work in rack V2.