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Orange street lights

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mattyoung | 23:02 Sun 04th Jul 2004 | How it Works
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Why are the bulbs in street lights orange?
  
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Have'nt seen many orange street lights, but many of the older type vapour lamps produced a yellow light that was quite common, gradually newer type metal halide lamps are replacing these, which have a more neutral light
Street lights use High Pressure Sodium (HPS) which produces the orange glow
I thought that they were that orangy color to show up better in foggy situations??????
you get more lumens for your buck
The darker orange lamps are low pressure sodium vapour(SOX), and the brighter white/orange lamps are high pressure sodium vapour(SON). The hotter the gas gets the brighter the light.
Sodium vapour lamps are orange whatever the pressure.

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Orange street lights

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