1. Graphic Tools For Showing Light
ART 2640, Building Systems of Interior Environments Fall Semester 2016 Tuesdays & Thursdays 9:00-10:20 Grover Center E218
Matthew Ziff, Associate Professor
M. Arch, Architect, NCIDQ
Office: W 325 Grover Center
Office Hours: MW: 11-12, 1-2
Telephone:
Graphic Tools For Showing Light
Rendering and Light Maps

2. Light Mapping: Showing light
Draw the light that you want to create for the space.
Use yellow, yellow orange, orange pencils
Indicate where you wish to see light on surfaces, objects, etc.
Remember; light is only seen on surfaces, not in the air.

5. The Light Mapped Plan The keys to success in creating a light map
Think only in terms of light you want to create. Not:
Practicality
Ability to construct
Luminaire location
Luminaire
Think about the quality of light and where it goes
Focus on surfaces and objects and how they receive and reflect light

6. The Light Mapped Plan Adding to the impact of a Light Map
Vary rendering techniques to represent different sources
Create a legend that explains what you are showing
Describing Light
Annotate details that can not be clearly understood through the drawing alone
Color, texture, and intensity of the light
How light effects mood
How the light interacts with surfaces
“When in doubt, add a description”
Use the 5 layers of light when developing a light map.
Light Mapping Choreography
Develop symbols

7. Lighting Units and Measurements

8. It’s all about the Lumen
Foot-Candle – light produced onto an object a foot away from a candle
Lumen – the basis of all lighting study
Onto or striking a surface – illuminance /1 fc = 1 lumen / 1 sq ft.
Off or leaving a surface – exitance / no unit of measurement
Exitance = illuminance multiplied(x) reflectance of surface
If reflectance is 50%, existance is half the illuminance
Leaving a surface in a specific direction with a specific density
Candelas per square meter (CD/sq.M)
steradian of spherical area – area made of a portion of a sphere

9. Understanding Illuminance Levels

10. Illuminance Level Intuition
Foot Candles = FC
Full Moon Light = 0.1 FC
Exterior Parking Lot = 1.0 FC
Dim, Romantic restaurant = 5.0 FC
Comfortable Living Room = 10 – 15 FC
Residential den / study = 20 – 35 FC
Classroom / Open Office = 50 – 70 FC
Laboratory / Exam Room = 100 FC

11. Adding Illuminance Values to a light map
Annotate Light Map
Indicate foot candle requirement
Based on tasks
5 – 35 foot candles = ambience
35 – 55 fc = common in office areas, classrooms, etc.

12. Lighting for Visual Interest
Accent and feature lighting
2 times rule
Object should be two times brighter than adjacent surface
2 to 5 times is comfortable
More than 5 times creates glare
Example = wall surface has 10 fc
Art would have 20 to 50 fc

13. IES Illuminance Level Criteria
Illuminating Engineering Society of North America (IESNA)
Scientific body that studies light and its effects on human visual performance
Published book

14. IES Illuminance Level Criteria
Lighting Design Concerns Checklist
Desired contrast / distinct accents
Desired sparkle / visible sources
Accurate color rendering
Color Appearance of environment
Mood and emotional atmosphere
Modeling of objects and faces
Visual Task performance
System control and dimming
Daylighting integration / control

15. IES Illuminance Level Criteria
Lighting Design Concerns Checklist
Glare Reflections / Specular Materials
Sensitivity to flicker / strobe effect
Sensitivity to glare
Energy Conservation / efficiency
Maintenance concerns
Heat concerns
Noise concerns
Light level evenness (reducing shadows)