/24-7PressRelease/ - BROOKLYN, NY, July 27, 2008 - The technology in high intensity discharge lighting is in some ways similar to fluorescent technology: an arc is established between two electrodes in a gas-filled tube which causes a metallic vapor to produce radiant energy. In this case, however, a combination of factors shifts the wavelength of much of this energy to within the visible range, so light is produced without any phosphors. In addition, the electrodes are only a few inches apart (at opposite ends of a sealed "arc tube") and the gases in the tube are highly pressurized. This allows the arc to generate extremely high temperatures, causing metallic elements within the gas atmosphere to vaporize and release large amounts of visible radiant energy. There are three main types of HID lamps: mercury vapor, metal halide and sodium. The names refer to the elements that are added to the gasses in the arc stream which cause each type to have somewhat different color characteristics and overall lamp efficiency.
Ballasts and Warm-Up Time
Like any gaseous discharge light source, HID lamps have special electrical requirements that must me supplied by ballast. With HID sources, however, the ballast must be specifically designed for the lamp type and wattage being used. In addition, HID lamps require a warm-up period to achieve full light output. Even a momentary loss of power can cause the system to restrike and have to warm up again- a process that can take several minutes. In applications where constant illumination is important for safety and security, a backup system is often required. The LUMALUX Standby lamp offers instant restrike capabilities once power is restored, making it an ideal choice for applications where safety is a concern.
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