High-pressure sodium vapor lamps for open and closed luminaires. Product features: Lamp survival rate: 95% for 16,000 hours of operation. Lamp maintenance factor: = 80% for 16,000 hours of operation (according to DIN 13201). Useful life (maintenance cycle): 4 years (at approx. 11 hours/day). Dimmable with conventional ballasts and electronic ballasts. Product advantages: Very high luminous efficacy. Very good luminous flux behavior over the service life. Up to 50% energy savings when replacing mercury vapor lamps (HQL). Optimum energy efficiency when operated with EVG POWERTRONIC® PTo 3DIM. Areas of application: Streets. Outdoor lighting. Industrial plants. Suitable for closed and open luminaires. Outdoor applications only in suitable luminaires.