Osram VIALOX High-pressure sodium vapor lamp for open and enclosed luminaires. This product provides high luminous efficacy, long lifetime, and very good luminous flux maintenance throughout the life of the lamp. Energy savings of up to 50 % when replacing inefficient mercury vapor lamps . Optimum energy efficiency on POWERTRONIC PTo 3DIM ECGs. Dimmable on conventional control gears and electronic control gears. Suitable for use in open and enclosed luminaires such as streets, outdoor lighting, industrial installations. Outdoor applications only in suitable luminaires.