Troffer
From Infogalactic: the planetary knowledge core
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 are also available in surface mount 'boxes'.
Use
The troffer is the most common type of light fixture for use in commercial office spaces, schools, and lab facilities.
Etymology
The word 'troffer' is a portmanteau of 'trough' and 'coffer'.[1]
References
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