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Calculations and the Laws of Illumination

Terms. Luminous Intensity (I)Luminous flux (F)Illuminance (E)Luminance (L). Candela (cd)Lumen (lm)Lux (lx)Nit (nt). Terms. Luminous Intensity (I)The illuminating power of a light sourceLuminous flux (F)The flow of light measured in lumensIlluminance (E)The measure of light falling on a su

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Calculations and the Laws of Illumination

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    1. Calculations and the Laws of Illumination

    2. Terms Luminous Intensity (I) Luminous flux (F) Illuminance (E) Luminance (L) Candela (cd) Lumen (lm) Lux (lx) Nit (nt)

    3. Terms Luminous Intensity (I) The illuminating power of a light source Luminous flux (F) The flow of light measured in lumens Illuminance (E) The measure of light falling on a surface Luminance (L) The measured brightness of a surface

    4. The laws There are 2 important laws in illumination, these are: Inverse Square Law Cosine Law

    5. Inverse Square Law This law assumes that the illumination received on a surface from a light source is inversely proportional to the square of it’s distance from the source In other words, the further away, the less illumination

    6. Inverse Square Law The inverse square law can be calculated by: Where E is illuminance I is Luminous intensity d is distance

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