Practice question

What is the 'veiling luminance ratio' in roadway lighting design?

  1. The ratio of luminaire cost to energy savings
  2. A measure of disability glare that reduces the apparent contrast of objects on the roadway, calculated as the ratio of veiling luminance to the adaptation luminance
  3. The ratio of roadway width to pole spacing
  4. The ratio of lamp wattage to luminaire wattage

Answer: B — A measure of disability glare that reduces the apparent contrast of objects on the roadway, calculated as the ratio of veiling luminance to the adaptation luminance

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