Discussion
Match the quantity with its unit.
1. Luminous flux 2. Illuminance 3. Luminous efficacy
P. Lumens per watt Q. Lumen R. Lux
Answer: A
Correct answer: 1-Q, 2-R, 3-P
Three quantities and three units. Luminous flux is measured in lumens, the total light emitted. Illuminance is measured in lux, the flux arriving per square metre. And efficacy is lumens per watt, the flux obtained per unit of electrical power - the figure of merit for a lamp.
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