Discussion
Painting a workshop's walls and ceiling in a light colour reduces the lighting energy needed because it
Answer: A
Correct answer: raises the utilisation factor
Light striking a pale surface is reflected back into the room instead of being absorbed, so a greater proportion of the flux emitted reaches the working plane. The lamps are unchanged; what improves is how much of their output is put to use, and in a room with high walls the effect is substantial.
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