Physics · Illumination
Which of the following statements are correct about the maintenance factor in illumination design? I) It is the ratio of illumination under normal working conditions to the total lumens given out by the lamp. II) It is the ratio of illumination under normal working conditions to the illumination when everything is perfectly clean. III) The accumulation of dust, dirt, and smoke on the lamp decreases the maintenance factor. IV) It is the ratio of illumination when everything is perfectly clean to the illumination under normal working conditions.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Statements II and III✓
- 2Statements III and IV
- 3Statements I and III
- 4Only Statement II
Correct answer
Statements II and III
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