Discussion
Assertion: replacing every lamp with the highest efficacy type available is the correct lighting measure. Reason: efficacy determines the energy consumed for a given light output.
Answer: D
Efficacy does determine the energy per lumen, which is why it matters, but colour rendering, dimming, restrike and the illuminance actually required all constrain the choice. Replacing lamps in an over-lit room also invests in light that should have been removed.
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