The luminous efficiency of a lightbulb is the ratio
Chapter 34, Problem 34.45(choose chapter or problem)
The luminous efficiency of a lightbulb is the ratio ofluminous flux to electric power input, (a) What is theluminous efficiency (%) of a 100-W, 1700-lm bulb? (b ) Howmany 40-W, 60-lm/W fluorescent lamps would be needed toprovide an illuminance of 250 lm/m2 on a factory floor ofarea 25 m X 30 m? Assume the lights are 10 m above thefloor and that half their flux reaches the floor.
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