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| u | Amplitude
= Intensity relates to brightness |
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| l | Measures
use only that light that is effective in |
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| stimulating
the human eye. |
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| l | Important
types of measures of Amplitude |
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| 1.
Illuminance - light falling on a surface |
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| 2.
Luminance - light coming off a surface |
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| 3.
Reflectance = luminance/illuminance |
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| 4.
Contrast Ratio = luminance of brightest area/luminance |
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| of darkest area |
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