Energy efficiency and long life Rated Average Life 24,000+ Hours*;For applications where instant restrike is not required, rated average Life is 40,000 Hours.;* Rated average life is the life obtained, on the average, from large representative groups of lamps in laboratory tests under controlled conditions at 10 or more operating hours per start. It is based on survival of at least 67% of the lamps and allows for individual lamps or groups of lamps to vary considerably from the average Dual arc-tube delivers 40,000 hour rated average life as compared to 24,000 hour rated average life for standards HPS lamps. Ideal for industrial applications, warehouses, post top applications and parking lots. Extra ArcTube Offers Light Instantly after momentary power Interruption and will provide 80% light output within 12 Minutes.;Operateson standard HPS ballasts and auxiliary equipments.;Available in 250, and 400 Watt ED18 mogul base / Available in 50, 70, 100, and 150 Watt, ED 23-1/2 mogul base / Available in 1000 Watts E-25 mogul base. Ideal for security lighting, roadway lighting, warehouse lighting, and industrial applications.