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A sodium vapor lamp is a gas discharge lamp that uses sodium excited state tо generate light. There are two variations on this type of bulbs according to their working pressure: the low pressure and high pressure. Sodium low pressure lamps are the most efficient electric light sources, but their yellow light is often limited in use in outdoor lighting projects such as streetlights. On other hand, sodium high pressure lamps have a broader spectrum of light, but in a poor color reproduction in comparison with other types of fixtures. Since sodium lamps cause less light pollution than mercury vapor lamps many cities use them as their lighting solution.
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