Tri Lite Dock dock lights and safety products are the standard for warehouse dock illumination and traffic control communication. Loading docks are busy environments. Look to Tri Lite for the tools you need to increase efficiency and provide a safer work place for your valuable employees. The Tri Lite High Pressure Sodium (HPS) Head is available with any of our dock arms except the SDL. These highly efficient sodium lamps provide the equivalent light of a 500 watt incandescent lamp while consuming a mere 50 watts! Low energy consumption and a bulb life of 24,000 hours greatly reduce operating costs. This low temperature lamp is also available with a food service cover. Constructed of super tough polycarbonate construction for long service life, these lamp heads provide excellent performance. Polycarbonate diffuser cover included.