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 th...
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...
Incandescent
• Tungsten filament heated to a high temperature,
causing it to glow
• Bulb protects the filament from air to...
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...
Mercury
• Lamp has UV radiation emissions
• At high pressure, mercury gas re-emits radiation as light
• Emission is concen...
Metal Halide
• Metal halides are added to mercury lamps (thallium,
indium, sodium iodide)
• Improves color quality
• CRI =...
Low Pressure Sodium
• When turned on, small current passes through the
sodium in the bulb, giving off a faint red discharg...
High Pressure Sodium
• Not as efficient as low pressure sodium lamps
• Radiate energy across the visible spectrum
• CRI = ...
`
Common Light Source Indexes
Type of Light Source CRI
Low Pressure Sodium
5
Clear Mercury
17
High Pressure Sodium
24
Coat...
Interactive Color Booth
Upcoming SlideShare
Loading in …5
×

110930 color rendering

363 views

Published on

0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
363
On SlideShare
0
From Embeds
0
Number of Embeds
10
Actions
Shares
0
Downloads
14
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

110930 color rendering

  1. 1. AN INTRODUCTION TO TES November 7, 2008 Color Rendering Presented By: Sarah Douglass September 30, 2011
  2. 2. 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
  3. 3. Color Rendering of Daylight
  4. 4. Types of Light Sources 1. Incandescent 2. Halogen 3. Fluorescent 4. Mercury 5. Metal Halide 6. High Pressure Sodium 7. Low Pressure Sodium
  5. 5. 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
  6. 6. Halogen • Incandescent lamp filled with halogen gas • Higher operating temperature • Dimmable • CRI = 100
  7. 7. 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
  8. 8. 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
  9. 9. Metal Halide • Metal halides are added to mercury lamps (thallium, indium, sodium iodide) • Improves color quality • CRI = 85
  10. 10. 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
  11. 11. High Pressure Sodium • Not as efficient as low pressure sodium lamps • Radiate energy across the visible spectrum • CRI = 24
  12. 12. ` 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
  13. 13. Interactive Color Booth

×