1)the lapm is high efficacy 2)long life,related energy saving. 3) ... 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 is high efficacy,long life and related energy savings,is used ... 150 16000 24000 50000 E26/E27 ED/T High Pressure Sodium Lamp for 70/150/250/400/1000W