(Filament lamp) : Mr.Kantoli S.B. Firstly, the pulse starts an arc through the xenon gas which makes the lamp turns sky blue due to xenon lighting up. Today the outer bulb is internally coated with a thin layer of a fluorescent phosphor which converts the UV into visible light, generally at the red end of the spectrum where the mercury output is lacking, to improve the colour rendering properties of this light source. The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the. However in the Americas and Asian countries its low system cost, long life and high colour temperature continue to make it a desirable light source for exterior illumination. The outer bulb may be clear or coated with a phosphor. It gives greenish blue colour light, which causes colour distortion. The gap between these electrodes is much smaller, and the voltage gradient is sufficiently high that ionisation will occur. Table 1.4. The span rate of the lamp is 24,000 hours. Usually, it works up to 24,000 hours. A schematic diagram of mercury lamp is shown below. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates UV light to excite the phosphors. Although the field of applications of these lamps as U.V. The mercury vapor lamp is similar in construction to the sodium vapor lamp. The development by General Electric of a sintered aluminum oxide material (with magnesium oxide added to improve light transmission) was an important step in construction of a commercial lamp. The ballast port connection is made as follows. What is the purpose of Ballast and ignitor in the mercury-vapor lamp? Once free electrons, ions and photons have been produced in the arc tube it is then very easy to strike a discharge across the main electrodes. In the modern, high-pressure mercury vapor lamp was developed, which works by electrifying solid mercury, which then vaporizes in a high-pressure tube and produces a bright light between two electrodes. By comparison with other common discharge lamps, mercury vapour sources have the lowest luminous efficacy. Designed by experienced engineers, and by using quality material in combination with a tightly controlled manufacturing process, we provide high quality lamps free of impurities to maintain strong and stable output throughout life of the lamp. High-pressure mercury-vapor lamps are the usual type of lighting utilized for highways, parking lots, highbay factories and similar applications. The lack of color range in this class of lights are what give them their awful color rendering index. The mercury vapor and neon gas (pink in color) present in the bulb requires high voltage at the starting to illuminate light. This pulse starts an arc through the xenon gas. Incandescent Lamp. - Metal Halide Lamps. The outer bulb may be clear or coated with a phosphor. 5). Mercury vapor lamps are used widely for lightining purposes although their use is certainly decreasing, not that much related to performance issues but mainly due to the hazards associated with them, as we shall see later in this article. 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