Energy efficiency and long life Low mercury - better for the environment.;Long Life - 24,000 hours Rated Average Life.;High efficacy up to 140 LPW. These lamps pass the EPA's TCLP test for non-hazardous materials. Ideal for industrial applications, warehouses, post top applications and parking lots. Low total cost of ownership.;Long lifeup to 24,000 hours.;High efficacy up to 140 LPW.;ALTO Lamp Technology - Sustainable solution.;ED 18 Available in 200, 250 and 400 watt; ED-23 1/2 Available in 50, 70,100, and 150 watt Ideal for street and roadway lighting, parking lots and garages, warehouses and manufacturing facilities where lower maintenance costs are desired.