Machine-translated by Google. Questions are authored in English.
Top

Discussion

Luminous efficacy of a source is measured in

  • A.watts per lumen of light output produced
  • B.candela per square metre of emitting surface
  • C.kelvin per watt of electrical power consumed
  • D.lumens per watt of electrical power consumed

Answer: D

It measures how effectively electrical power becomes visible light. It says nothing whatever about how well the source renders colours. Efficacy and rendering are quite separate measures. Neither can be inferred from the other.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.