LLC Landscape Lighting Energy Efficiency & Sustainability 2

Question 1

What is the primary reason LED landscape fixtures are rated for a longer lifespan than traditional halogen fixtures?

Accepted Answer

LEDs use solid-state technology with no filament to burn out

Answer

LEDs are solid-state devices with no fragile filament, allowing rated lifespans of 50,000+ hours versus halogen's 2,000–4,000 hours.

Question 2

A client wants to minimize light pollution on a residential property. Which fixture mounting style is most effective?

Accepted Answer

Full-cutoff downlighting fixtures

Answer

Full-cutoff fixtures direct all light downward, eliminating upward spill that contributes to skyglow and light pollution.

Question 3

Which transformer feature allows a landscape lighting system to automatically adjust output voltage based on wire run length?

Accepted Answer

Multi-tap terminals

Answer

Multi-tap transformers provide multiple voltage output options (e.g., 12V, 13V, 14V) to compensate for voltage drop over long wire runs.

Question 4

In terms of energy sustainability, what advantage does a zoned control system offer over a single-zone timer?

Accepted Answer

It allows different areas to run only when needed, reducing unnecessary runtime

Answer

Zoned controls let high-traffic areas run longer while accent zones run briefly, cutting total energy consumption without sacrificing aesthetics.

Question 5

What does the term 'lumen maintenance' refer to in LED landscape fixture specifications?

Accepted Answer

The percentage of initial lumens an LED retains at a specified point in its life

Answer

Lumen maintenance (e.g., L70) describes how long an LED retains 70% of its initial lumen output, indicating long-term energy efficiency.

(LLC) Landscape Lighting Certification Practice Test