Amazon.com : Ultra Sun HPS 1000 Grow Lamp - Full Spectrum High Pressure Sodium Lamp, Ideal for Plant Growth, 1000 W : Video Projector Lamps : Patio, Lawn & Garden
Spectrum of sodium : D lines : Easy learning : - YouTube
Na spectrum | Emission spectrum for a sodium light. | Rather Anonymous | Flickr
Sodium-vapor lamp - Wikipedia
Hydrogen-Like Atoms:Sodium
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
The light spectrum of high-pressure sodium (HPS) and plasma lights. | Download Scientific Diagram