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Low pressure sodium lamp could be the very best supply of solar street lighting technique: low pressure sodium lamp emission wavelength is monochromatic light and 589.6nm 589.0nm. The 2 yellow spectral line positions close to the human eye is most sensitive wavelength is 555.0nm green spectral lines, not simply has higher luminous efficiency, and in the eyes in the world will not possess a colour, so see high resolution, excellent contrast for in road, overpass, tunnel and intersections large visibility and colour prerequisites. Low pressure sodium lamp also has no glare. The luminescence efficiency is 200lm/W low pressure sodium lamp, electrical light supply is the highest light efficiency of a light supply, the life is long.

Low pressure sodium lamp luminous efficiency of higher luminous efficiency, short light effect. It is actually the luminous flux emitted from a light source and its electric power ratio, unit is lumens per watt (LM / W), is the evaluation of electrical light source electrical power efficiency the primary technical parameters. The flux is refers towards the dimension of light radiation per unit time, employed to represent the lumen. The greater the luminous flux emitted by power supply unit, low pressure sodium lamp is by way of very low stress sodium vapour discharge luminous electric light supply from the glass shell coated with IR reflecting film is smaller attenuation and luminous efficiency highest electrical light supply. Through the low pressure sodium lamp is monochromatic yellows and locations for that colour won't demand, but the "fog" carried out really nicely, especially for highway, street site visitors, municipal roads, public round, backyard lighting, can make folks clearly see the color difference is tiny.

Low pressure sodium lamp is definitely an choice to higher strain mercury lamp to save electricity, a lamp, application can be expanding.