Lecture 04 - Illumination

Lecture 04 - Illumination - Visual Presentation of Visual...

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isual Presentation of Visual Presentation of Information • Photometry isual acuity • Visual acuity • Recommendations
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I. Photometry Luminous flux Rate at which light energy is emitted from a source gg y r a light with a wave length of 555 nm 555nm a with 683 1 lumen 1 = = W for a light with a wave length of 555 nm • Intensity Amount of energy radiated by a source lumens emitted per solid angle ( candela , cd) urce its 2 7 1-cd source emits 12.57 lm
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Photometry • Illuminance or Illumination Amount of light falling on a surface minous ux er nit rea otcandle ) luminous flux per unit area ( footcandle , fc) 1 fc= 1 lm/ft 2 = 10.76 lx (1 m2 = 10.76 ft 2 ) = amount of light on a surface located 1 foot from a 1 candle source etric units Lux = 1 lm/m 2 0 093 fc (fc) metric units 1 Lux = 1 lm/m = 0.093 fc (fc) D ormal cidence) 2 istance source of Intensity Illum = E = I/D 2 (normal incidence) lumination om ources Distance Illumination from n sources E=E 1 +E 2 + ... + E n
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Photometry (cont.) • Luminance or Brightness mount f ht flected y urface ot ambert ) Amount of light reflected by surface ( foot Lambert , fL) B= (R × E) / π (SI system) = R (fL) B R × E 1 fL = Brightness of a surface (100% reflectance) uminated y illuminated by 1 fc Reflectance = 00 /E L/fc) R (%) 100 B/E (fL/fc)
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Photometry (cont.)
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Lecture 04 - Illumination - Visual Presentation of Visual...

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