Hard Core 277 Volt Ballast Open ballast design is compact and runs cool! Hard Core™ offers superior cooling capabilities while extending the longevity of the capacitor and ignitor. Powder-coated steel housing with louvered venting and solid design helps protect internal components. Rubber feet reduce noise & vibration. Excellent ballast quality with high temp 150°C wire connections will provide years of trouble-free operation. Removable stainless steel handles allow easy handling. Comes wired with eight foot 277 Volt power cord. Compatible with all Sun System® reflectors.