Discussion
Cleaning luminaires is a no-cost lighting measure because dirt
Answer: A
Correct answer: absorbs light that has already been paid for
The lamp draws the same power whether the luminaire is clean or dirty, so every lumen absorbed by dirt is energy bought and thrown away. Cleaning restores it for the price of the labour alone, which is why it is the first item in any lighting audit and why the maintenance factor exists in the design.
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