Question

The ratio of illumination under normal working conditions to the illumination when everything is perfectly clean is
(A) Reduction factor
(B) Utilisation factor
(C) Maintenance factor
(D) Beam factor​

Answer 1

Answer:

lux

Illumination can be expressed in

radians.

lux.

Answer 2

Maintenance Factor always less than 1

Explanation:

• Maintenance factor may be defined as the ratio of illumination under normal conditions to the illumination when everything is perfectly clean.
• The value of maintenance factor is usually less than 1, and it will around 0.8. This is often because as the accumulation of dust, dirt and smoke on the lamps in order that they emit less light  than that they emit after they are perfectly clean.
• Improvement of Maintenance Factor are often achieved by frequent cleaning of lamp.
• The maintenance factor can be determined by the look lighting engineer and also the new value of the radiant flux multiplied by it.