Discussion
Assertion (A): Triphosphor lamps trade rendering of saturated colours for efficacy.
Reason (R): Concentrating the emission into three narrow bands leaves gaps elsewhere.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Triphosphor lamps put their output into three narrow bands placed where the eye is most responsive, which is why they are efficient and score well on the standard index. But a saturated colour reflecting only between those bands has almost no light to reflect, so it renders poorly - a defect the eight pastel samples of the index barely register.
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