The SSL230 is a sleek, specification-grade unit which is perfect for interior spaces such as galleries, exhibits, boutiques, residences, and similar areas where high-intensity light is needed. The SSL230 Series is designed for all short-neck PAR30 medium screw base Solid State LED Retrofit lamps up to 20 watts and incandescent lamps up to 75 watts (lamp by others). Lamp size: 3.88" (max length), 3.75" (max diameter).; The SSL230 features include rugged steel self-locking full yoke, on/off switch on most mounting types, and internal accessory clips for the full line of up to three LSI size A accessories, including: Glass Color Filters, Spread Lens, Louver, Cross Baffle, Backer Ring and Light Blocking Screens.