Discussion
Comparing a relamping measure with a control measure in a space lit continuously through the shift, the relamping
Answer: A
Correct answer: saves throughout, while controls have no hours to remove
A control measure saves only the hours it can switch off, and in a continuously occupied space there are none. A more efficient lamp saves in every one of those hours. The two measures are therefore complementary rather than alternatives, and which one pays depends entirely on the occupancy pattern.
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