How do I fix a ceiling light when there is no ceiling rose.?

Maybe a dumb question but do I have to get any special fittings etc?
How do I fix a ceiling light when there is no ceiling rose.?
If you are in the UK legally you cant. If you take any of the above advice you are more nuts than they are. Get an approved electrician. (NICEIC uk)
Reply:It all depend on how many wires are up there. If there are only two or three, you will have no problem.

The ceiling rose comes in two pieces the first is the baseplate and this has brass blocks attached to it. These blocks are marked L, N, and E. Each block has 3 grub screws in it. Make a hole in the base plate by striking out one of the plastic panels. Feed the 3 cables through it and secure the baseplate to the wooden ceiling joist.

fasten the Red or Brown wire to the outermost hole on the L block using the grub screw. Likewise for the Black or blue (N eutral) and the Green (E arth)

Take the bulb holder part and wire it to the base plate in the same manner as above, using a different hole in each block. Red to L Black/Blue to N and green to E, using the grub screws.

Then close the whole unit by screwing the two pieces together. Put in your bulb and switch on. Easy.

If you have more than three wires, consult an electrician, or if you are not confident to do it yourself. It won't cost much.
Reply:If there is wiring there and a wall switch connected to them, then there should be an electrical junction box (either metal or plastic) which has two threaded holes. These are size 8x32 (if you are in the USA). A new fixture has a bracket which is slotted and will fit a 3" box (old style) or 4" size. These fixtures come with the brackets (but not the screws) 3/4 inch in length. Again size 8 x 32 (thread size). These "straps" as they are called , will support the fixture that they come with.

Good Luck and work safe ! ! !
Reply:What do you have at the moment? Is it just a wire poking thru the ceiling? Final question - what sort of light do you want to fit?