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Luminous efficacy is expressed in

  • A.candela per watt
  • B.watts per lumen
  • C.lumens per watt
  • D.lumens per square metre

Answer: C

It states how much light a lamp gives for the electricity it consumes and is therefore the single figure by which lamp families are ranked. Comparing two installations on wattage alone, without it, says nothing about the light delivered.

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