... long life,related energy saving. 3)It is used for street,square,port and so on. Characteristics and ... uses:High pressure sodium lamps is the third generation of new energy developed in Twentieth century ,the sixties.It ... efficacy,long life and related energy savings,is used for square,street,port.Complied with GB 13259-91.Discription ... 50000 E26/E27 ED/T High Pressure Sodium Lamp for 70/150/250/400/1000W