Foot candle calculation on desk surface


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    Cameron Kipp


    I was able to find that information in the Ballast ARE 5 review manual on page 32-11. The formula is:

    E  = (I  X cos θ) / d2

    • E is illumination measured in foot-candles
    • I is candlepower measured in candelas
    • d is the distance from the source
    • θ is the adjustment to account for the angle from vertical


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