Just to clarify this. It supports standardized IEEE 802.3af and 802.3at Power over Ethernet specifications. It does NOT support the passive, non-standardized 24V PoE that Ubiquiti used early on for the UAP-AC-Lite and UAP-AC-LR (and I believe some of their cameras too). If you have an old UAP-AC-LITE or -LR, you may not be able to power off of these switches.The PoE variants of both the 6450 and 6610 supply 802.3at Power over Ethernet Plus (PoE+). You're better off looking up data sheets for this type of info.
I am currently using Mikrotik S+RJ10 modules both a 6450 and 6610 without issues to convert SFP+ to 10Gbase-T. They are pretty cheap, and as long as you don't need too many you'll come out ahead.
However, there are converter modules you can get and you can always use a power injector. If you got one of those any time in the last year or so, you're probably okay. Check around on the Ubiquiti forums and they may be able to get you a date code or serial number checker that will tell you what it supports.