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Mercury vapor lamps fall within the category of negative resistance illumination fixtures. Most of these fixtures usually require some type of ballast in order to perform at a high level. Replacement ballasts are often used with mercury vapor lamps because they tend to be more energy efficient, giving your bulb a longer lifespan in the long run. Replacement ballasts are important because the lamp may take on too much excessive current, resulting in overload and shutdown. RLLD has a great selection of replacement ballasts for your convenience. When you initially turn on a mercury vapor lamp, you will notice that the bulb emits a dark blue glow. This results from only a small amount of mercury being ionized and because of low gas pressure. On the color spectrum, light waves would fall within the ultra-violet range during this initial startup. Once the main arc strikes and the gas begins to increase in temperature, along with pressure, light starts to shift into the visible range and appears more white to the naked eye. It should be noted that even at full luminosity, the light produced by a mercury vapor bulb is not continuous on the visible end of the spectrum. Viewers who are looking at a non-phosphor bulb will notice a bluish light instead of the traditional white light we are so accustomed to seeing. In order to adjust for this bluish color, manufacturers do construct mercury vapor lamps, which have a phosphor coating on the outer bulb. This coating converts a large percentage of UV emissions into red light. This helps to close the gap on the vacant red part of the electromagnetic spectrum associated with mercury vapor bulbs. People used to complain about the type of light these fixtures used to produce. Non-phosphor fixtures made people look like "bloodless zombies" because of the very low light levels at the red end of the electromagnetic spectrum. Most modern applications have phosphor within the bulb's design, giving a more vibrant color to human skin under such applications. All mercury vapor lamps produce ultraviolet radiation, which can be harmful to your body and your beautiful artwork. There are safety features, which can be purchased or built into the fixture in order to prevent these rays from escaping. A strong outer guard or lens is needed to protect the lamp's outer bulb. There are also special safety lamps, which will automatically burn out if the glass on the outer bulb has shattered. Mercury vapor lamps are widely used in tree lighting involves aesthetic design considerations, therefore placement recommendations should serve only as a general guide. These recommendations are based on an average luminance of 10 foot candles and provide suggested number wattage of landscape lighting kits to achieve moonlight effects in various size trees. Determine the approximate canopy size of the tree by multiplying the width and height of the tree in feet. Use these chart figures to select the number of fixtures recommended depending on the density of foliage and the amount of moonlight illumination you would like to achieve.
Article Source: http://www.BharatBhasha.com Article Url: http://www.bharatbhasha.com/home_improvement.php/72241 Article Added on Sunday, March 23, 2008
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