Lighting

1. Lighting • A quick overview • The Physics • The Practical

2. What is Light • "Light is visually evaluated radiant energy.“ • Electromagnetic Spectrum http://www.glenbrook.k12.il.us/gbssci/phys/Class/light/u12l2a.html http://www.arce.ukans.edu/book/contents.htm

3. What is the Purpose of Light • Allow Performance of Tasks • Mood • Disguise • Emphasize

4. Basic Physics • Light enters eye, usually reflected from something • Converted to electrical impulse • Processed by Brain

5. The Lighting Designer’s Task • Artistic - Achieve an effect • that creates a “mood” • That influences behavior • Functional • Put enough light of the right kind on the “work surface” so a person can work. • Do it economically. • This is where the engineer focuses

6. Characteristics of Light that matter • Energy magnitude - brightness • Relative levels • Produces contrast • Absolute • Wavelength - Color

7. Methods of Light Production • Older Ways • Daylight • Wood burning • Gas burning • Candle • Gas from tube

8. Terms of the Trade • IES • Illuminating Engineering Society of North America • Lamp = Bulb • Luminaire = The fixture holding the bulb • Efficacy = Number of “lumens per watt” • Color Temperature = The temperature of a solid block producing the same color light.

9. Color from Lamps

10. Key Issues in Practice • How light reflects from surface • Reflection • Absorption • Diffusion

11. Why Do we Use different Lamps? • Cost • Initial Cost • Efficiency = Operating Cost • Color Rendition • Ability to focus light • Longevity

12. Lamps – Low Efficiency • Incandescent • Standard • Halogen

13. Lamps – Higher Efficiency • Low Pressure Discharge • Fluorescent • Low Pressure Sodium • High Pressure Discharge • Mercury Vapor • Metal Halide • High Pressure Sodium

14. Luminaires • Used to direct light • Up • Down • Sideways • Combination

15. Material Resources • Ching – A Visual Dictionary of Architecture • Mechanical & Electrical Equipment for Buildings