high pressure sodium lamps: 1,T46 tubular shape; 2,120lm/W high luminous efficiency; 3,Niobium tube arc,long lifespan 4,E40 we manufacture high pressure sodium lamps:1,T46 tubular shape;2,120lm/W high luminous efficiency;3,Niobium tube arc,long lifespan;4,E40 base;5,CE certificate passed;