1) Light fixture 
A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2` by 2` or 2` by 4`). Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but a...
long recessed luminaire usually installed with the opening flush with the ceiling