In illumination,  = ?

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MPPGCL JE Electrical 28 April 2023 Shift 1 Official Paper
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  1. Reduction factor
  2. Maintenance factor
  3. Absorption factor
  4. Utilisation factor

Answer (Detailed Solution Below)

Option 1 : Reduction factor
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Detailed Solution

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In illumination engineering, the Reduction Factor is defined as:

Mean Spherical Candle Power (MSCP): The average luminous intensity of a source in all directions.

Mean Hemispherical Candle Power (MHCP): The average luminous intensity over one hemisphere.

The reduction factor helps in determining how uniformly a light source emits in different directions.

Additional Information

  • Maintenance factor: It is defined as the ratio of the illumination under normal working conditions to the illumination when the things are perfectly clean.
  • Absorption Factor: It is related to how much light is absorbed by surfaces instead of being reflected.
  • Utilisation Factor: It is the ratio of light reaching the working surface to the total light emitted.

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