50W Philips High Pressure Sodium ED 23.5 shape 2100k This 50w philips high pressure sodium light bulb has a base of E39 Mogul Screw Base and a CRI of 21 Ra8. It has a color temperature of 2100k, a diameter of 2.938 inches and a clear lamp finish. This 50w philips high pressure sodium bulb has a lumens of 4300, a maximum overall length of 7.75 inches and a rated life of 24000 hours. TheseThis 50w philips high pressure sodium pass the EPA's TCLP test for non-hazardous materials. Ideal for industrial applications, warehouses, post top applications and parking lots.