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