We got a little 8-port 10-gigabit Ethernet switch to act as the (temporary) hub for our statewide dark fiber network. It's from one of our usual vendors, but this thing is... different. I'm pretty sure they OEM'ed it from another company. The CLI is different, the hardware architecture is different, and the lights... well, let's just say that a frantic flashing pattern alternating yellow and green wouldn't be my first choice to indicate a disabled port. You flash things to indicate a PROBLEM, not to highlight that something is not in use.
A short movie showing this phenomenon. It doesn't show up nearly as dramatically on my phone camera as it looks to the eye, unfortunately.