1 Lighting A quick overview The Physics The Practical

2 What is Light "Light is visually evaluated radiant energy. Electromagnetic Spectrum

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 Designers 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 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