1 X 4 Foot LED Troffer Retrofit Kit, 2900 Lumens, 4000K, 120-277V Fixture Length_4 Feet (48 in) This 4 Foot LED Strip

This 4 Foot LED Strip Light provides an economical and energy-efficient option perfect for surface installation in stairwells

Single/Double Face offers an understated metal housing for a traditional look

two of which with reversible dual finish blades

Bolt Circle:  11" (Bolt Circle Range 10"-12")

What does direct/indirect mean

1 X 4 Foot LED Troffer Retrofit Kit, 2900 Lumens, 4000K, 120-277V Fixture Length_4 Feet (48 in) This 4 Foot LED StripFEATURES: Wattage: 21W Lumens: 2900 Lumens Voltage: 120 277 CCT: 4000K CRI: >80 0 10V dimmable driver 3 Piece Versatile Volumetric Selectable Troffer Retrofit Kit allowing for quick, easy and simple installation. 5 year warranty DLC Premium, ETL listed, Title 24