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Transcript of 110930 color rendering
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AN INTRODUCTION TO TESNovember 7, 2008
Color Rendering
Presented By: Sarah DouglassSeptember 30, 2011
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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
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Color Rendering of Daylight
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Types of Light Sources
1. Incandescent2. Halogen3. Fluorescent4. Mercury5. Metal Halide6. High Pressure Sodium7. Low Pressure Sodium
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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
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Halogen
• Incandescent lamp filled with halogen gas• Higher operating temperature• Dimmable• CRI = 100
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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
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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
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Metal Halide
• Metal halides are added to mercury lamps (thallium, indium, sodium iodide)
• Improves color quality• CRI = 85
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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
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High Pressure Sodium
• Not as efficient as low pressure sodium lamps• Radiate energy across the visible spectrum• CRI = 24
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Common Light Source Indexes
Type of Light Source CRI
Low Pressure Sodium5
Clear Mercury 17
High Pressure Sodium 24
Coated Mercury 49
Standard Fluorescent 50-70
Metal Halide 85
Triphospher Fluorescent 85
Incandescent/Halogen 100
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