Low Pressure Sodium LPS lamps are more closely related to fluorescent than High Intensity Discharge lamps, since they have a low–pressure, low–intensity. - ppt download
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Sodium-vapor lamp - Wikipedia
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High- and Low-Pressure Sodium Lamp | SpringerLink
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DigiLamp – 1000W High Pressure Sodium Lamp – Allstate Garden Supply
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High Pressure Sodium Vapor Lamp: Definition, Working, and Applications | Electrical4U
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Na spectrum | Emission spectrum for a sodium light. | Rather Anonymous | Flickr
File:High Pressure Sodium Lamp Spectrum.jpg - Wikimedia Commons
Emission spectrum of a high pressure sodium lamp. | Download Scientific Diagram
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