CLC Outdoor & Landscape Lighting 2 — Questions and Answers
Question 1: Which lighting technique places a fixture close to a wall or vertical surface to reveal texture and surface detail?
- Grazing (Correct answer)
- Moonlighting
- Silhouetting
- Cross-lighting
Correct answer: Grazing
Grazing positions a fixture very close to a textured surface at a steep angle to emphasize its texture and depth.
Question 2: What is the primary reason to use low-voltage landscape lighting systems (12V) rather than line voltage (120V) in residential gardens?
- Greater energy efficiency only
- Reduced shock hazard and easier DIY installation (Correct answer)
- Higher lumen output per fixture
- Longer cable run capability
Correct answer: Reduced shock hazard and easier DIY installation
12V systems present a much lower shock hazard and do not require conduit burial, making them safer and easier for residential landscape applications.
Question 3: When illuminating a tree using the uplighting technique, where should the fixture ideally be aimed?
- Directly at the base of the trunk
- Into the canopy to illuminate foliage from below (Correct answer)
- At a 45-degree angle toward neighboring trees
- At the top branches from a distance
Correct answer: Into the canopy to illuminate foliage from below
Uplighting fixtures are aimed into the canopy to cast light through the foliage, creating a dramatic effect from below.
Question 4: Which IP rating is the minimum recommended for landscape fixtures installed in areas subject to direct rain exposure?
- IP20
- IP44
- IP65 (Correct answer)
- IP33
Correct answer: IP65
IP65 indicates the fixture is dust-tight and protected against water jets, making it suitable for direct rain exposure.
Question 5: A client wants to create a 'moonlighting' effect in their backyard. Which installation approach achieves this?
- Mounting fixtures at ground level aimed upward at 70°
- Mounting fixtures high in trees aimed downward through branches (Correct answer)
- Installing fixtures at mid-height on fence posts
- Using underwater fixtures in a pool to reflect upward
Correct answer: Mounting fixtures high in trees aimed downward through branches
Moonlighting mounts downward-aimed fixtures high in trees to mimic the soft, dappled light of the moon filtering through foliage.
Question 6: What color temperature range is generally preferred for residential landscape lighting to achieve a warm, inviting appearance?
- 5000–6500K
- 4000–4500K
- 2700–3000K (Correct answer)
- 6500–7500K
Correct answer: 2700–3000K
2700–3000K produces a warm white light that enhances plant colors and creates an inviting atmosphere in residential landscapes.
Question 7: Which control strategy is most effective for automatically adjusting outdoor landscape lighting to seasonal changes in sunset time?
- Manual on/off switches
- Astronomical (solar) time clocks (Correct answer)
- Motion sensors only
- Photocells set to a fixed lux threshold
Correct answer: Astronomical (solar) time clocks
Astronomical time clocks calculate local sunrise and sunset times based on GPS coordinates and date, automatically adjusting on/off times year-round.
CLC Outdoor & Landscape Lighting 2
Which lighting technique places a fixture close to a wall or vertical surface to reveal texture and surface detail?