High Pressure Sodium (HPS) Ballast Kits include the following components; Transformer, Ignitor (Starter), Capacitor, Universal mounting bracket, and wiring schematic. Standard Probe Start Metal Halide ballast kits include the transformer and Capacitor. These are replacement component kits, not complete ballast enclosures, and are designed to replace a failed ballast in an existing lighting system and do not include the socket or an enclosure