Universal lighting industries offersmanufactures reference ballasts. These reference ballasts are used for various gas discharge lamps, such as fluorescent, compact fluorescent, hpmv, hpsv, lpsv, and metal halide lamps. These reference ballasts are are special ballasts which confirmconforming to stringent performance requirements, and having stable and repeatable characteristics. Inthey are useful in evaluating the performance of the discharge lamps including the selection of reference lamps reference ballasts are applied.These the reference ballasts are also useful to a ballast manufacturer which works for evaluation of his product, as they make available directly the standard reference parameters against which the product can be compared. These ballasts are made hey are manufactured conforming to bis, iec, bs, and jis specifications.