70 Watt S62 High Pressure Sodium Quad Tap Ballast KitHPS Ballast Cross Reference: Advance Ballast 71A7971 001D Sylvania Ballast LU70 MULTI KIT Keystone HPS 70X Q KIT MagneTek 12310 153 500K Howard S007071C511K Venture V90D1233K Grainger 1A975 High Intensity Discharge (HID) lamps require a ballast to apply starting voltage to the lamp and establish current flow an arc between the lamp electrodes. Without a ballast, the arc will extinguish or draw increasing current until some circuit element burns up.