which colour light is produced in street lamps by sodium vapours
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yellow colour light is produced in street lamps by sodium vapours
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Sodium vapor lamps are some of the most efficient lamps in the world. They have an efficiency of up to 190 lumens per watt compared to an incandescent street lamp which has between 15 and 19 lumens per watt.
These sodium vapor lamps come in two major groups:
High pressure sodium (HPS) lampslow pressure sodium lamps (LPS)
Compared to LPS lamps, high pressure sodium lamps tend to have a longer bulb life, less lumen per watt efficiency and most importantly, a higher color rendering index. Low pressure sodium lights are considered to have the worst color rendering index of any lamp but are incredibly efficient.
Spectral Output
The spectral output of LPS lamps is incredibly focused at two wavelengths 589 nm and 589.6 nm. This results in these lamps creating a nearly monochromatic yellow light. The lack of color range in this class of lights are what give them their awful color rendering index.
This low color rendering index essentially means that it is very difficult to differentiate between the different colors of objects illuminated by this lamp. In other words it is difficult to perceive colors in a space illuminated by these lamps because of their almost monochromatic yellow light.
The uniquely focused color of low pressure sodium lamps although largely considered a flaw of LPS lamps is one of the reasons why some call for wider use of the lamps. This output is in the range of wavelengths that the human eye is most sensitive to causing LPS lamps to appear brighter to the human eye. Our sensitivity to the color produced by LPS lamps is part of what makes them so efficient and makes them a green option for lighting.
Another unique characteristic of these LPS lamps emitting light in only these wavelengths is that it makes the lamps contribute less to light pollution. Astronomers have an easier time removing the spectral data of these lights as an outlier because it is so specific to the wavelengths of 589.6 nm and 589 nm.
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These sodium vapor lamps come in two major groups:
High pressure sodium (HPS) lampslow pressure sodium lamps (LPS)
Compared to LPS lamps, high pressure sodium lamps tend to have a longer bulb life, less lumen per watt efficiency and most importantly, a higher color rendering index. Low pressure sodium lights are considered to have the worst color rendering index of any lamp but are incredibly efficient.
Spectral Output
The spectral output of LPS lamps is incredibly focused at two wavelengths 589 nm and 589.6 nm. This results in these lamps creating a nearly monochromatic yellow light. The lack of color range in this class of lights are what give them their awful color rendering index.
This low color rendering index essentially means that it is very difficult to differentiate between the different colors of objects illuminated by this lamp. In other words it is difficult to perceive colors in a space illuminated by these lamps because of their almost monochromatic yellow light.
The uniquely focused color of low pressure sodium lamps although largely considered a flaw of LPS lamps is one of the reasons why some call for wider use of the lamps. This output is in the range of wavelengths that the human eye is most sensitive to causing LPS lamps to appear brighter to the human eye. Our sensitivity to the color produced by LPS lamps is part of what makes them so efficient and makes them a green option for lighting.
Another unique characteristic of these LPS lamps emitting light in only these wavelengths is that it makes the lamps contribute less to light pollution. Astronomers have an easier time removing the spectral data of these lights as an outlier because it is so specific to the wavelengths of 589.6 nm and 589 nm.
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