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Engineering: HPS lamps
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History of street lighting in the United States — The use of street lighting was first recorded in the Arab Empire from the 9th 10th centuries, [Fielding H. Garrison, History of Medicine :quote| The Saracens themselves were the originators not only of algebra, chemistry, and geology, but of many … Wikipedia
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NEMA wattage label — NEMA wattage labels are used on street lighting fixtures to indicate the wattage of the lamp for maintenance purposes. Yellow sticker indicate the lamp is a sodium vapor lamp (HPS/LPS) Blue sticker indicates the lamp is mercury vapor (MV) Red… … Wikipedia
Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr … Wikipedia