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084f2db8c6 The current control element in lead circuit ballasts consists of both inductive and capacitive reactance in series with the lamp; however, the net reactance of such a circuit is capacitive in mercury and metal halide ballasts, and inductive in high pressure sodium ballasts. High pressure sodium lamps retain their light output at the end of life, however, starting becomes intermittent at first and then impossible. How Lamp starts: In cold state mercury vapor and halides are in non-ionized state. The integrated circuits in both types of ballasts continuously monitor input line voltage and lamp conditions and regulate lamp power to the rated wattage. So we find there are two parameters, which determine the life of Metal Halide and other HID lamp (i) Ageing- No of burning hours. Check the ballast: If it is an older system, it could be simply the normal end of ballast life. Halogen Incandescent bulbs These also contain a tungsten filament, but are filled with a halogen compound and an inert gas (krypton or xenon). 2) Overheated due to heat in the fixture or ambient temperature.
Standard Ignitors are supplied with all High Pressure Sodium, Pulse Arc, and Metal Halide ballast requiring ignitors. Slow or erratic Starting Check ground (fixture must be grounded for reliable starting) Check ballast label for correct lamp. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. Life: A long lamp life of 20,000 to 24,000 hours, and the best lumen maintenance of all HID sources. The arc tube voltage rises with usage; therefore, the wattage and lumen output change with age. The energy supplied is transformed into heat by the Joule effect and into luminous flux. Electronic Ballast. In this situation, the reactor ballast performs only the current-limiting function since the voltage necessary to initiate the ignitor pulses, and start and sustain the lamp comes directly from the input voltage to the fixture.