The Sun System Hard Core DE Ballast is designed specifically for use with 1,000W, double-ended HPS lamps. To achieve this, the ballast core and windings were greatly modified from existing models, and the construction/ layout of the wires coming off the coils were adapted. All 2,100-µmol DE 1,000W HPS lamps that were tested attained, and often exceeded, their 2,100-µmol performance. The Hard Core DE 1,000W ballast, which is a true quad volt, features Sun System’s dual universal lamp cord receptacle. There is a 120V and 240V input, and the machine comes with an eight-foot long, 120V power cord. Robust and repairable, the Hard Core DE 1,000W ballast is an incredible value.