RLM Standard Dome, Industrial Grade Shade, Nostalgic Elegance and Simplicity of Design Measurements Diameter: 18"Height: 11 1/4" Special Features This dome is made of 18 gage, cold-rolled steel and coated with genuine powder coat or an exquisite plated finish. Ballast Options FluorescentMetal HalideIncandescentHigh Pressure Sodium Note: A150HPS always requires a remote box(cat#884RTE or 884SCE) Notes Max. Suggested Wattage: 300