Practice question

What is 'efficacy' in the context of a light source?

  1. The color temperature of the light
  2. The ratio of lumens produced per watt of electrical power consumed (lumens per watt)
  3. The beam angle of the luminaire
  4. The mounting height of the pole

Answer: B — The ratio of lumens produced per watt of electrical power consumed (lumens per watt)

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