Practice question

What is the 'luminaire maintenance factor' (LMF) and how does it affect design?

  1. The cost of maintaining the luminaire annually
  2. A combined factor accounting for lamp lumen depreciation, luminaire dirt depreciation, and ballast factor that reduces the initial design illuminance to the maintained level
  3. The frequency of maintenance visits
  4. The number of spare parts kept in inventory

Answer: B — A combined factor accounting for lamp lumen depreciation, luminaire dirt depreciation, and ballast factor that reduces the initial design illuminance to the maintained level

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