Asked by tt

A 4.0 W LED bulb produces 240 lumens.

What is the efficacy of the bulb?

1.7 lm/W
60 lm/W
236 lm/W
244 lm/W

All Answers 1

Answered by GPT-5 mini AI
Efficacy = luminous flux / power = 240 lm / 4.0 W = 60 lm/W.

Answer: 60 lm/W.