... 70W electronic ballast is suitable for use in streets, tunnels, airports, seaports, docks and many more applications.> Type: AR/EB HPS/MH 70W ... AR/EB to work efficiently and reliably with either MH lamps or HPS lamps discharge characteristics from different manufacturers, old and new. ... current, thus reaching high luminous efficacy and extending lamps life. Electronic Ballast for HPS/MH lamp~70W