I'll vouch for the circuitry. My projector (when improperly powered off) will turn back on and display "OVER TEMPERATURE" in big scary red letters. It well then cool itself off, shut off and on until it's properly cycled itself off.

As for UPS's, they're basically a nice padding, you can even get single outlet models that you put up in the ceiling or wherever your projector is plugged in.
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"Big John is my Idol...or is it that other way around? Let's ask Ray!"