Discussion
Which measurement expresses a lamp's photometric performance?
Answer: D
Approval requires minimum and maximum candela at defined points in the beam. Lumens genuinely measure total output and are quoted for bulbs, which makes the last option a real measure used for a different purpose. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.
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