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Dimming Systems for High-Intensity Discharge Lamps
Title:  Dimming Systems for High-Intensity Discharge Lamps
Date:  1994
Author(s):  Robert Wolsey; Yunfen Ji
Number of Pages:  8
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Dimming Systems for High-Intensity Discharge Lamps summarizes information from dimming system manufacturers and from lamp manufacturers. It also helps explain the technical concerns associated with dimming high-intensity discharge (HID) lamps by discussing relevant literature and presenting NLPIP test results. The HID lamp family includes high-pressure sodium, metal halide, and mercury vapor lamps. HID lamps typically consist of a sealed arc tube inside a glass envelope or outer jacket. The inner arc tube is filled with elements that emit light when ionized by electric current. The mixture of elements within the arc tube is one of the primary distinguishing characteristics of the different types of HID lamps. The advantages of dimming include energy savings, reductions in peak power demand, and enhanced flexibility for multi-use spaces.

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