LLC Landscape Lighting Energy Efficiency & Sustainability 3

Question 1

When calculating the energy savings of replacing 20W halogen path lights with 3W LED equivalents across 15 fixtures running 8 hours/night, what is the daily wattage reduction?

Accepted Answer

2,040 Wh

Answer

Each fixture saves 17W; 17W × 15 fixtures × 8 hours = 2,040 Wh (2.04 kWh) saved per day.

Question 2

Which color temperature (CCT) is most commonly recommended for sustainable landscape lighting to minimize disruption to nocturnal wildlife?

Accepted Answer

2700K (warm white)

Answer

Warm white (2700K or lower) contains less blue-spectrum light, reducing impact on insect and wildlife circadian rhythms compared to cool white sources.

Question 3

A landscape lighting system uses a photocell-enabled transformer. What is the primary sustainability benefit of this feature?

Accepted Answer

It automatically turns the system off at sunrise and on at sunset without manual adjustment

Answer

Photocells eliminate user error in timer settings, ensuring lights never run during daylight hours and reducing unnecessary energy consumption.

Question 4

What is the recommended maximum load percentage for a low-voltage landscape lighting transformer to ensure long-term reliability and efficiency?

Accepted Answer

75%

Answer

Loading a transformer to no more than 75% of its rated capacity reduces heat buildup and extends component life, improving system reliability.

Question 5

Which wire gauge is most appropriate for a long landscape lighting run exceeding 100 feet to minimize voltage drop?

Accepted Answer

12 AWG

Answer

12 AWG wire has lower resistance than 16 or 18 AWG, significantly reducing voltage drop on runs exceeding 100 feet and improving fixture efficiency.

(LLC) Landscape Lighting Certification Practice Test

(LLC) Landscape Lighting Certification Practice Test

LLC Landscape Lighting Energy Efficiency & Sustainability 3