I haven't dealt with it myself, but Ubiquiti makes one that is priced close to what you'll pay for normal lighting. The big difference is that you're not paying an electrician to wire the things in, "just" network cable installers. Which can be a big difference in certain areas of the country.
I'm curious to see how far the PoE industry will go. It'll be cool to see in 10 years what the average person can power over PoE.
Why? What's the reason for wanting that? You can basically power any super low voltage DC device with it today. And that's handy for data devices where that reduces a cable since it needs a connection to the switch anyway. Other than that, sounds not just boring, but just bad.
I'm kinda in the same boat - why do I want my lights tied into my switches costing me money on ethernet ports? Why not just have those lights tied directly into AC power?
I mean remote access to control the lights, sure I get that - but giving them power via POE? why?
Also, it's just funny to think of IT being in charge of the lights.