Certainly tempted to install one of these, wired from the loft down into the upstairs hall - do they all come with the power over ethernet adaptors, or support for them?
Also do you need/want special ethernet cable for poe and is there a limit on the cable run (its <20m at a guess...)
Finally - can you disable the LED ring on it through software or would it have to be electrical tape?
They all come with PoE injectors.
The basic model uses 24V PoE (aka passive PoE). In case you already have a PoE switch, most PoE switches only have full PoE : 48V.
So you need to either use the supplied injector, buy their poe in-line converter (limited to 100Mbps on current model) or buy a Ubiquiti switch that does both 24V and 48V. Most people just use the supplied injector.
The Pro model uses 48V PoE, so you can use it with any PoE switch.
No need for a special cable, just make sure it's got the full 8 wires, not one of those stupid 4 wire ethernet cables that you sometimes get with cheap networking equipment.
Light can be turned off easily in the software. It's more of a glow as it's the reflection of the LED that you actually see.