troffer

long recessed luminaire usually installed with the opening flush with the ceiling
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-10-13

Troffer

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...
Found on http://en.wikipedia.org/wiki/Troffer
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