Thanks for the reply siddle.
I think i have used the wrong description, did a search on google and it is call downlight (not light box, pardon me on that).
It is one of my downlights coming loose, everything else is fine and i can still switch it on and off. Mine is those square type downlights, does anyone know how are these downlights normally secured to the ceiling? Is it with screws, latches at the sides or something else?