Osram VIALOX Clear Tubular SON-T Lamp are high pressure sodium lamp. One of the brightest and most economical SON lamps. 20% higher efficiency and direct replacement for NAV®-E Standard and 4Y versions. Ideal for street lighting, floodlighting and indoor lighting in heavy industry. · · · Lamp survival factor: 95 % after 16,000 h burning time · · Average lifetime: up to 36,000 h · · Service lifetime: 4 years (at approx. 11 h/day) · · Service lifetime: 4 years (at approx. 11 h/day) · · ErP compliant according to EU Regulation 245/2009 · · Dimmable on conventional control gears and electronic control gears · · Long lifetime · · Very high luminous efficacy · · Very good luminous flux maintenance throughout the life of the lamp · · Energy savings of up to 50 % when replacing mercury vapor lamps (HQL)