China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Light ballasts are necessary in all lighting fixtures equipped with an an arc source light bulb such as fluorescent, high pressure sodium or metal halide ballasts. 
A ballast essentially functions as a power converter altering the incoming electrical current to provide the proper voltage and amperage for operating a given light source. Additionally, the ballast or ballast kit controls the starting function of the arc source lamp by providing either a preheating function or a simple voltage surge as required by the light bulb for correct ignition. Ballasts are generally rated for a specific lamp type and wattage or in the case of electronic fluorescent ballasts for a range of acceptable lamp types.

If you're planning on redoing the lighting in your business, you want the best of the best. And that means not just having a light fixture that looks good on the outside, it means keeping it working on the inside. At James Lighting, we care about what's going on with your project, which is why we encourage you to shop our selection of lighting ballasts. Simply defined, a ballast is an electrical component that regulates the amount of current in the electric circuit. Much like the engine of a car, a ballast is what's "under the hood."
As a general rule lamp and ballast combinations should have matching specifications to avoid early lamp failure or other serious electrical system issues.