CLC CLC Residential Lighting Design 1 — Questions and Answers
Question 1: The layered lighting approach in residential design combines which three primary layers?
- Task, accent, and decorative
- Ambient, task, and accent (Correct answer)
- Natural, artificial, and emergency
- General, supplemental, and highlight
Correct answer: Ambient, task, and accent
The three-layer approach (ambient, task, accent) provides flexibility and visual interest by serving different functional and aesthetic needs simultaneously.
Question 2: For residential kitchen countertop task lighting, the IES Handbook recommends a maintained horizontal illuminance of approximately how many foot-candles?
- 5–10 fc
- 30–50 fc (Correct answer)
- 75–100 fc
- 150–200 fc
Correct answer: 30–50 fc
IES recommends 30–50 fc maintained on kitchen countertops to support safe food preparation and detail work.
Question 3: In residential bathroom design, luminaires flanking a vanity mirror on both sides are preferred over a single overhead fixture primarily because they eliminate which issue?
- Energy waste from over-illumination
- Downward shadows on the face that impair grooming tasks (Correct answer)
- Excessive glare on reflective tile surfaces
- Color temperature inconsistency between lamps
Correct answer: Downward shadows on the face that impair grooming tasks
Side-mounted vanity lighting at eye level eliminates unflattering downward shadows on the face, improving visibility for grooming and makeup application.
Question 4: Which lamp CCT range is most commonly recommended for warm, inviting residential living spaces in US homes?
- 2700K–3000K (Correct answer)
- 3500K–4000K
- 5000K–5700K
- 6500K+
Correct answer: 2700K–3000K
The 2700K–3000K range produces warm white light that complements wood tones and skin tones, creating a comfortable residential atmosphere.
Question 5: When specifying recessed downlights in a residential ceiling, the spacing-to-mounting-height (S/MH) ratio is used to ensure adequate what?
- Lamp life
- Illuminance uniformity across the floor plane (Correct answer)
- Dimming compatibility
- Thermal management
Correct answer: Illuminance uniformity across the floor plane
The S/MH ratio guides fixture spacing to achieve even light distribution, preventing bright spots under fixtures and dark areas between them.
Question 6: In a residential setting, a lighting control that automatically adjusts light levels based on time of day to support the occupant's circadian rhythm is best described as which type of system?
- Occupancy-based switching
- Astronomical time-clock with scene control
- Tunable white (dynamic CCT) human-centric control (Correct answer)
- Emergency transfer system
Correct answer: Tunable white (dynamic CCT) human-centric control
Tunable white systems dynamically adjust both CCT and intensity throughout the day to align electric lighting with natural daylight cycles and circadian biology.
CLC CLC Residential Lighting Design 1
The layered lighting approach in residential design combines which three primary layers?