High-pressure sodium lamps provide the highest luminous efficiency of all high-pressure discharge lamps. They are the most economical light sources in general lighting.
Nominal wattage 400 W Rated wattage 392 W Lamp current 4.6 A Nominal voltage 100 V Ignition voltage 3.3 / 5 kVp Rated lamp efficacy (standard condition) 122 lm/W Rated luminous flux 48000 lm Color rendering index Ra ≤25 Color temperature 2000 K Rated LLMF at 2000 h 0.97 Diameter 47 mm Length 285 mm Light center length (LCL) 175 mm Maximum permitted outer bulb temperature 400 °C Maximum permitted base edge temperature 250 °C Lifespan B50 24000 h Lifespan B10 16000 h Lifespan B5 12000 h Operation mode LLMF/LSF 50 Hz Base (standard designation) E40 Design / version Clear Lamp mercury content 19.9 mg Dimmable Yes Burning position Any Enclosed luminaire required No Energy efficiency class A+ Energy consumption 432 kWh/1000 h
Benefits • High luminous efficacy
Areas of application • Streets • Outdoor lighting • Industrial installations • Suitable for use in open and enclosed luminaires • Outdoor applications only in suitable luminaires