The illumination at a point on a working plane directly below the lamp is 100 lumens/m², the lamp gives 256 candles the power, uniformly below the horizontal Plane determine the height at which the lamp is suspended. Also find illumination at a point on the working on table 1.2 meters away from the vertical axis of the lamp?
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Explanation:
The illumination just below the lamp, E = 60 lumen/m2. Example 6.7: A lamp having a candle power of 300 in all directions is provided with a reflector that directs 70% of total light uniformly on a circular area 40-m diameter. The lamp is hung at 15 m above the area.
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1.6
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