CID CID Lighting Design and Technology 1 — Questions and Answers
Question 1: Which lighting layer provides general illumination throughout a space and is considered the base layer of a lighting plan?
- Accent lighting
- Task lighting
- Ambient lighting (Correct answer)
- Decorative lighting
Correct answer: Ambient lighting
Ambient lighting serves as the foundational layer that provides overall illumination for a space.
Question 2: What is the unit of measurement used to quantify the amount of light falling on a surface?
- Lumen
- Candela
- Foot-candle (Correct answer)
- Watt
Correct answer: Foot-candle
A foot-candle measures illuminance, which is the amount of light (lumens) falling on one square foot of surface.
Question 3: Which color rendering index (CRI) value is considered the minimum acceptable for spaces requiring accurate color perception, such as retail showrooms?
- CRI 60
- CRI 80 (Correct answer)
- CRI 70
- CRI 50
Correct answer: CRI 80
A CRI of 80 or above is considered the minimum acceptable threshold for spaces where accurate color rendering is important.
Question 4: In interior design, what does CCT stand for in reference to light sources?
- Color Coordinate Temperature
- Correlated Color Temperature (Correct answer)
- Calibrated Color Tone
- Central Color Transfer
Correct answer: Correlated Color Temperature
CCT (Correlated Color Temperature) describes the warmth or coolness of white light, measured in Kelvin.
Question 5: Which type of lighting is specifically designed to draw attention to artwork, architectural features, or display objects?
- Ambient lighting
- Task lighting
- Accent lighting (Correct answer)
- Kinetic lighting
Correct answer: Accent lighting
Accent lighting is used to highlight specific objects or features, typically requiring three times more light than ambient levels.
Question 6: What is the recommended illuminance level (in foot-candles) for typical office task lighting per IES standards?
- 5–10 fc
- 50–100 fc (Correct answer)
- 150–200 fc
- 200–300 fc
Correct answer: 50–100 fc
The IES recommends 50–100 foot-candles for general office task lighting to ensure comfortable and productive work conditions.
CID CID Lighting Design and Technology 1
Which lighting layer provides general illumination throughout a space and is considered the base layer of a lighting plan?