Efficacy of a lamp means?
A)Lumens light output per watt of electrical input power to lamp
B)Efficiency at converting colour temperature into illuminance on the working plane
C)Percentage of lamp globe or tube surface area that emits light
D)Proportion of lamp light output directed toward the working plane
E)Luminous efficacy is total illuminance produced divided by lamp electrical input power including all control equipment consumption

Question

Quizplus · Accepted Answer

Efficacy of a lamp refers to the lumens of light output per watt of electrical input power to the lamp, which is a measure of how efficiently a lamp converts electrical energy into visible light.

Efficacy of a Lamp Means