General lighting used in offices and commercial settings with T-bar ceiling grids. Low profile recesses lights often fit where pendants will not work (less than 9'6"). The three main types are lensed, parabolic or perforated basket. Other options include flanged, battery backup and size. Sizes include 2X4, 2X2 and 1X2. The more common lensed troffer will have a hinged door to easily replace the T8 or T5 lamps.