Practice question

What is the 'inverse square law' as it applies to roadway lighting?

  1. Doubling the number of luminaires doubles the light output
  2. Illuminance decreases with the square of the distance from the light source
  3. Using twice the wattage produces twice the color temperature
  4. The brightness is inversely proportional to the lamp life

Answer: B — Illuminance decreases with the square of the distance from the light source

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