This Alphalite LED Outdoor Surface Canopy SCL-40/50K has a square form factor. The modern and reliable design delivers long life and energy savings. It is 40 watts and provides 3,600 lumens. This product was designed to mount directly on to the surface. Also to note that it is capable to provide resistance against corrosion, rust, weathering, and UV degradation. The warranty is 5 years with a DLC certification.