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240V is 240V, however...
Lighting circuit might (would be if installed nowadays) be on 1.5mm cable and a 6A breaker. Projectors are usually plugged into a socket on 2.5mm cable and anything up to a 32A breaker.
You might want to look at the numbers to make sure your projector is not going to draw enough current that would cause the thinner lighting cables to overheat, especially if they run through any insulation. Or that it is not going to continually throw the trip.
A better solution* (if access allows), would be to run a fused spur from one of the socket circuits on the floor above** with a fuse suitable for the projector. I would want to be going in from the floor above anyway to make sure there's enough support for the projector.
*in my limited DIY view.
**just because it would be physically closer to the ceiling than the sockets on the same floor. It would be neat if you could have a switched, fused spur next to your lightswitch purely for the projector.
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stevo_com
New place has two ceiling roses, one of which is ideally placed for a ceiling mounted projector.
Can I take un-switched 240v from a ceiling rose somehow? Can I still use the other rose as a switched light, presuming they’re on the same circuit?
Guess I could always just put a smart bulb in the remaining fitting and keep the light switch on for projector power.