lec11 - Key objectives in Lighting design Visual...

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Unformatted text preview: Key objectives in Lighting design Visual performance Physiological conditions Visual quality no strong "contrasts" good "color rendering" adequate "light levels" no "disturbing reflections" no direct "glare" Radio- and photometric quantities Radiometry vs. Photometry absolute (energy) vs. V( )-dependent (light) 350 400 450 500 550 600 650 700 750 800 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Wavelength [nm] Relative Efficiency [-] Image by MIT OCW. Radio- and photometric quantities Radiometry vs. Photometry absolute (energy) vs. V( )-dependent (light) 1.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 350 400 450 500 550 600 650 700 750 800 Wavelength (nm) Relative efficiency [-] Image by MIT OCW. Radio- and photometric quantities Four major quantities flux illuminance intensity luminance Image by MIT OCW. Radio- and photometric quantities Flux energy / unit of time in Watts [W] vs. lumen [lm] Image by MIT OCW. Radio- and photometric quantities Flux energy / unit of time in Watts [W] vs. lumen [lm] 683 lumen/Watt at 555 nm : lum [lm] = 683 V( ) e [W] 75 watts 1055 lumens 70 watts 5600 lumens Incandescence Discharge very different efficacies ! Images by MIT OCW. Radio- and photometric quantities Flux Illuminance flux received / unit of surface E in [W/m 2 ] vs. [lm/m 2 ] or lux [lx] S Images by MIT OCW. Radio- and photometric quantities...
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lec11 - Key objectives in Lighting design Visual...

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