[sneak]

I think Ubiquiti (makers of the UniFi wifi products, as well as some of the most popular managed PoE switches) also make a ton of other PoE products such as the usual stuff like cameras, ip phones, network switches, access card readers, door locks, and, now, ceiling lights (presumably due to the latest PoE standards delivering significant wattage).

It's super nice because you only need to put the UPS/ATS at the PoE switch and then you get power redundancy everywhere you have ethernet running (i.e. the phones don't go down).