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110930 color rendering
 

110930 color rendering

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    110930 color rendering 110930 color rendering Presentation Transcript

    • AN INTRODUCTION TO TES November 7, 2008 Color Rendering Presented By: Sarah Douglass September 30, 2011
    • Color Rendering • Color rendering is the effect of a light source on the color appearance of objects by comparison with their appearance under a reference light source • Reference sources have a Color Rendering Index of 100 • CRI ranges from 0 (worst) to 100 (best) • Low CRI sources are cheap to operate but give off low quality light • High CRI sources cost more to operate but have higher quality light
    • Color Rendering of Daylight
    • Types of Light Sources 1. Incandescent 2. Halogen 3. Fluorescent 4. Mercury 5. Metal Halide 6. High Pressure Sodium 7. Low Pressure Sodium
    • Incandescent • Tungsten filament heated to a high temperature, causing it to glow • Bulb protects the filament from air to reduce the rate of tungsten evaporation • CRI = 100
    • Halogen • Incandescent lamp filled with halogen gas • Higher operating temperature • Dimmable • CRI = 100
    • Fluorescent • Cathode creates current • Mercury droplets radiate UV radiation • Phosphor coating produces light due to the UV radiation • Different phosphors affect the output spectrum • CRI = 50-85
    • Mercury • Lamp has UV radiation emissions • At high pressure, mercury gas re-emits radiation as light • Emission is concentrated in 5 narrow bands • CRI = 17-49
    • Metal Halide • Metal halides are added to mercury lamps (thallium, indium, sodium iodide) • Improves color quality • CRI = 85
    • Low Pressure Sodium • When turned on, small current passes through the sodium in the bulb, giving off a faint red discharge • When the sodium evaporates, the resulting vapor produces a yellow emission • Used almost solely for street lighting • CRI = 5
    • High Pressure Sodium • Not as efficient as low pressure sodium lamps • Radiate energy across the visible spectrum • CRI = 24
    • ` Common Light Source Indexes Type of Light Source CRI Low Pressure Sodium 5 Clear Mercury 17 High Pressure Sodium 24 Coated Mercury 49 Standard Fluorescent 50-70 Metal Halide 85 Triphospher Fluorescent 85 Incandescent/Halogen 100
    • Interactive Color Booth