They are sometimes referred to by manufacturers and distributors as universal ballasts, universal voltage ballasts, generic ballasts, or flexible ballasts, although none of these terms is an industry standard. “Adaptable ballast” is a term NLPIP uses to describe an electronic ballast with special circuitry that enables it to operate multiple lamp types, operate different quantities of lamps, and/or operate on multiple input voltages. rated light output - The sum of the initial rated lamp lumens of the lamp(s) that were supplied with the luminaire. Rated life is based on standard test conditions. The rated life is a median value of life expectancy any lamp or group of lamps may vary from the published rated life. rated lamp life - The number of hours at which half of a group of product samples fail. (Also referred to as fixture.) load shedding - The practice of turning off electrical devices during peak energy demand hours to reduce building energy use. luminaire - A complete lighting unit consisting of a lamp or lamps and the parts designed to distribute the light, to position and protect the lamp(s), and to connect the lamp(s) to the power supply. Metal halide, high-pressure sodium, and mercury vapor are types of HID lamps. high-intensity discharge (HID) - An electric lamp that produces light directly from an arc discharge under high pressure. electrodes - The structure that serves as the electric terminals at each end of electric discharge lamps.
compact fluorescent lamp (CFL) - A family of single-ended fluorescent-discharge light sources with small-diameter tubes. Ballast factor depends on both the ballast and the lamp type a single ballast can have several ballast factors depending on lamp type. ballast factor (BF) - The ratio of the light output of a fluorescent lamp or lamps operated on a ballast to the light output of the lamp(s) operated on a standard (reference) ballast. Ballast - A device required by electric-discharge light sources such as fluorescent or HID lamps to regulate voltage and current supplied to the lamp during start and throughout operation.
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