*Oversize design is excellent for large growing areas *Durable & attractive powder coated finish. *Compatible with all Sun System remote ballasts. *Highly reflective German aluminum interior for maximum output & uniformity. *Easily air-cooled by attaching optional 4in. fittings & glass. *Does not accept position oriented Metal Halide lamps (MS/HOR). *Dimensions: 19 3/4in L x 18in W x 6 1/4 in Tall The lamp cord & socket are built into the reflector - no need to purchase a separate socket assembly.