Metal Halide ballast kits 70,100,150, 175, 250, 400, 1000, and 1500 watt replacement . Metal Halide Ballast Kits include the following components; Transformer, Ignitor (if applicable), Capacitor, Universal mounting bracket. These are kits, designed to replace a failed ballast in an existing lighting system.

Reactor (R) The lag reactor is the simplest, smallest, most efficient and most economical type of ballast. Reactor type ballasts may only be used when line voltage is relatively stable and at least 10% higher than the rated lamp starting voltage. Reactors are generally used as normal power factor devices. Reactor ballasts normally have a low PF, but can be corrected to 90% with a capacitor, but this will not change the ballast's lamp regulation characteristics.

High Reactance Autotransformer (HX) This type of lag circuit consists of primary and secondary coils forming a one-piece unit. These are similar in operating characteristics to reactors but are generally used to increase the line voltage when it is lower than the level required for starting the lamp. By adding a capacitor across the primary coil (or across an extra capacitor winding) the system attains a power factor of over 90 % . This high reactance ballast is the most common type used for low wattage (less than 100W) MH lamps. In these cases, an ignitor is used. The HX ballast has a low PF unless a capacitor is used. Like the CWA ballast, this ballast can transform lower input voltages to a voltage high enough to start the lamps.

Constant Wattage Autotransformer (CWA) This lead circuit is the most commonly used in high intensity discharge lighting as it provides an economical means of providing stabilized light output (lamp regulation) as opposed to the lag circuits previously discussed. It is particularly recommended in installations where the line voltage fluctuations are greater than 5 %, but not greater than 10%. A 10% decrease in line voltage will give only a 5 % decrease in lamp watts. This is much better than the regulation characteristics of other ballast types. These ballasts have fairly good regulation, and the lamp wattage will change only 10% with 10% changes in the input voltage. They can tolerate a 30% voltage sag without extinguishing the lamp. This is the most common type of ballast used with standard MH lamps. Here, you don't need an ignitor, since standard MH lamps have starter electrodes. The CWA ballast transforms to a higher voltage, so you can use lower line voltages (120VAC). CWA ballasts use a capacitor and have a higher power factor (PF): greater than 90%.