A common type of office ceiling is the T-bar or the tiles ceiling that as from the name consists of loose square tiles held up by a grid-work of metal channels in the shape of an upside-down “T”. These dropped or suspended ceilings as they’re also called, are commonly built to hide infrastructure and control acoustics. In more high-end offices plaster ceilings are also used.
Office lighting fixtures for ceilings with tiles are usually recessed or suspended fixtures. When the fittings are recessed it simply means a hole is cut into the ceiling surface allowing the fitting to recess into the ceiling when being installed. Suspended fixtures means the lights are being hung from the ceiling by using suspension kits.
In plaster ceilings track lights or linear profiles can be used, either suspended, surface mounted or recessed depending on height and look of the ceiling. A very tall office ceiling would most likely use suspended fixture to bring them closer to the ground, whereas a ceiling under three metres would use surface mounted or track lights or linear profiles. The linear profiles can also be recessed into these type of ceilings.