How many 40w 60lmw fluorescent lamps would be needed to


How many 40W, 60lm/W fluorescent lamps would be needed to provide an illuminance of 250lm/m^2 on a factory floor of an area 25m x 30m? Suppose the lights are 10m above the floor and that half their flux reaches the floor

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Physics: How many 40w 60lmw fluorescent lamps would be needed to
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