The ratio of how much light is produced by a lamp (in lumens) to how much energy is consumed by the lamp (in watts) is known as
A)efficacy
B)efficiency
C)illumination cost
D)energy cost

Question

Quizplus · Accepted Answer

The ratio of lumens produced per watt consumed is known as efficacy. It is a measure of how efficiently a light source converts electrical energy into visible light. Efficiency, on the other hand, is a measure of how effectively the electrical energy is being used, regardless of the amount of light produced. Illumination cost and energy cost are not the correct terms for this ratio.

The Ratio of How Much Light Is Produced by a Lamp