What is maintenance factor?

Q.  Maintenance factor is the ratio of
- Published on 07 Sep 15

a. Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition
b. Lumens on the working plane under ideal working conditions to the lumens on the working plane under normal condition
c. Lumens falling on the working plane to the lumens emitted by the working plane under ideal condition
d. Lumens emitting by the working plane to the lumens falling on the working plane under ideal condition

ANSWER: Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition

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