A true lighting manufacturer, Spectrum produces major components of lighting fixtures that it sells, allowing total control of design, inventory, and quality. This enables Spectrum to custom design fixtures and retrofits ......A true lighting manufacturer, Spectrum produces major components of lighting fixtures that it sells, allowing total control of design, inventory, and quality. This enables Spectrum to custom design fixtures and retrofits quickly and economically. Spectrum makes more than just downlights... see us first for: RLM and Pendant Fixtures. Surface, Wall, and Pendant Mounted Cylinders, Squares, and Custom Design Track (1,2, &3 Circuit) and Track Fixtures. Corrosion and Vandal Resistant Fixtures. (Surface and Recessed) Chicago Ceiling Plenum Fixtures Specifiers and Architects look to SPECTRUM Lighting for a quality product that answers their needs. When you know its the best light for the job... Chances are the fixture came from spectrum.