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19 November, 03:25

A 4.0 W LED bulb produces 240 lumens. What is the efficacy of the bulb?

1. 1.7 lm/W

2. 60 lm/W

3. 236 lm/W

4. 244 lm/W

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Answers (1)
  1. 19 November, 05:30
    0
    Efficacy is the ratio of light output from a lamp or a bulb to the electric power it consumes and is measured in lumens per watt (LPW).

    In this case; the power is 4 watt and the number of lumens is 240.

    Efficacy = lumens/power

    = 240/4

    = 60 lm/W

    Thus the efficacy of the bulb is 60 lm/W
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