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by sitting_duck
1576 days ago
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A = 4 pi r^2 So a sphere of 2m radius has a surface of about 50 m^2. A 1000 lumen bulb illuminates the sphere with app 1000 lm / 50 m^2 = 20 lux (not 50 lux as OP wrote). So the calculation is a bit off. OTOH if we had bulbs that shine downwards only it would be sufficient to just divide by the floor. So 100,000 lm in a 10m^2 room gets you 10,000 lux. |
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