Product features:
· High pressure sodium lamp 250 Watt
· Increased luminous flux compared to standard high pressure sodium lamps
· Elliptical, electrostatic white coating inside
· Centrally-located, durable ceramic arc tube with integrated strike bar and sodium amalgam filling
· For ignitors from 4 to 5 kV
· Maximum lamp diameter 90 mm, maximum length 226 mm
· E40 base, nickel-plated brass for corrosion resistance
· Nominal luminous flux 31,000 lm
· Luminous efficacy 124 lm/W
· Light depreciation less than 10% after 16,000 hours of operation
· Early failure rate less than 5% after 16,000 hours of operation
· Average lifetime 32,000 hours of operation