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The radiant efficiency of the luminous source depends on

  • The radiant efficiency of a luminous source is dependent on the temperature of the source.
  • The temperature of the source determines the amount of energy that is emitted as visible light, which is known as luminous efficacy.
  • The higher the temperature of the source, the more efficient it is at emitting light.
  • This is due to the fact that as the temperature of the source increases, it emits more light per unit of power consumed, resulting in higher radiant efficiency.
  • This is also why sources such as incandescent light bulbs and candle flames are less efficient at converting energy into light than sources such as LED lights or fluorescent bulbs, which operate at cooler temperatures.