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  • Road Lighting
    It is not to be expected that low pressure sodium lamps or other type of gas discharge lamps will far exceed the 190 lm/W value.
  • Light and Light Sources
    Furthermore, street lighting with low pressure sodium lamps (monochromatic light of 589 nm, cf. Sect.
  • Pseudo‐natural Light for Displays and Lighting
    It is noted that the low pressure sodium lamp shows an incomprehensible nega- tive CRI, −12.[10] This strongly implies the inappropriateness of using CRI as a light-quality indicator.