Apollo Horticulture Double Ended Air Cooled Reflector Hood for Plant Growing 1  Double Ended Air Cooled Reflector Hood Dimensions: 20.50 x 20.25 x 7.75  Length w/ Flange: 24 total Flange Dimensions: 2 Length x 5.75 Diameter / Glass Opening: 11 total Galvanized Steel Hood with German Aluminum / Double Ended Socket for Maximum Efficiency Package Includes: 1 Double Ended Air Cooled Reflector Hood / 1  15 Power Cord / Instructional Pamphlet