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The lux is defined as

  • A.one candela per steradian
  • B.one lumen per square metre
  • C.one candela per square metre
  • D.one lumen per watt

Answer: B

It is the quantity a light meter reads and the quantity every lighting standard is written in, because it describes what falls on the task rather than what the lamp produces. The candela per square metre is luminance, which describes brightness as seen.

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