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Roadway Lighting Luminaire Codes for North America
Determining the lamp type and wattage of luminaires (and particularly roadway luminaires) in North America is fairly simple. Each luminaire includes a small rectangular sticker that indicates type of lamp and wattage. This sticker is to assist those responsible for replacing the burnt out lamps.
To purchase and view the full document, click here "Roadway and Area Lighting Equipment - High Intensity Discharge and Low Pressure Sodium Lamps in Luminaires - Field Identification" NEMA/ANSI C136.15-2009.
For a less formal reference, Wikipedia offers the article "History of street lighting in the United States" and makes reference to the luminaire identification system.
Identifying Color and Lamp Type
Yellow = High Pressure Sodium
Tan = Low Pressure Sodium
Blue = Mercury Vapor
Red = Metal Halide
In general, there is a two digit number placed on the sticker. You can easily identify the number by simply adding a "0" after the original two digits. For example, if a lamp says "10" the wattage is 100. Exceptions include 13, 17, 21, 87 which all have a "5" instead of a "0." If a lamp states it is "X1" then it is a lamp of 1000 lumens.