LLC Lighting Control Systems & Automation 2 — Questions and Answers
Question 1: What does 'dimming capability' in a landscape lighting transformer allow an installer to do?
- Reduce the number of fixtures connected to a single circuit
- Adjust the brightness output of compatible LED fixtures (Correct answer)
- Lower the transformer's primary voltage to reduce energy costs
- Decrease the cable gauge requirement for a run
Correct answer: Adjust the brightness output of compatible LED fixtures
Dimming capability allows the installer to reduce the light output of compatible fixtures, enabling ambiance control and energy savings without changing hardware.
Question 2: Which type of motion sensor is most commonly integrated into outdoor landscape lighting control systems?
- Ultrasonic sensor
- Passive infrared (PIR) sensor (Correct answer)
- Microwave radar sensor
- Laser tripwire sensor
Correct answer: Passive infrared (PIR) sensor
Passive infrared (PIR) sensors are most commonly used in outdoor landscape lighting because they detect body heat movement and are reliable, cost-effective, and low-power.
Question 3: In landscape lighting control, what does 'scene programming' allow?
- Presets that control multiple zones to specific brightness levels simultaneously with one command (Correct answer)
- Programming the color temperature of each individual fixture
- Recording a video of the landscape to use as a reference
- Setting the maximum wattage per circuit automatically
Correct answer: Presets that control multiple zones to specific brightness levels simultaneously with one command
Scene programming stores preset configurations that activate multiple lighting zones to defined brightness levels simultaneously, such as 'Entertaining,' 'Security,' or 'Away' modes.
Question 4: What is the purpose of a 'soft start' feature found on some landscape lighting transformers?
- It gradually increases voltage at startup to reduce inrush current and extend lamp life (Correct answer)
- It silences the audible buzzing on magnetic transformers
- It prevents voltage fluctuations from dimming circuits during a power surge
- It limits the total connected wattage to 80% of the transformer rating
Correct answer: It gradually increases voltage at startup to reduce inrush current and extend lamp life
A soft start gradually ramps up voltage when the system turns on, reducing inrush current stress on fixtures and extending the life of LED drivers and bulbs.
Question 5: When setting up a photocell and timer together on a landscape lighting system, what is the typical best practice for operation?
- Use photocell to turn on at dusk, and timer to turn off at a set time (Correct answer)
- Use timer to turn on at a fixed hour and photocell to turn off at midnight
- Use two separate photocells for redundancy and disable the timer
- Set the timer to override the photocell during daylight hours
Correct answer: Use photocell to turn on at dusk, and timer to turn off at a set time
Best practice is to use the photocell to trigger activation at dusk (adapting to seasonal changes) and the timer to set a fixed off time, balancing flexibility and energy savings.
Question 6: What is 'load shedding' in the context of a smart landscape lighting controller?
- Automatically disconnecting overloaded circuits to prevent transformer damage
- Removing low-priority lighting zones during a peak energy demand period to reduce power consumption (Correct answer)
- Shedding corrosion from fixture contacts before installation
- Turning off all zones simultaneously after a programmed duration
Correct answer: Removing low-priority lighting zones during a peak energy demand period to reduce power consumption
Load shedding turns off lower-priority lighting zones during peak energy demand periods, helping manage electricity costs and reduce grid strain.
Question 7: Which feature in a modern landscape lighting control system allows the intensity of lights to change at specific times of night?
- Sunset mode
- Time-based dimming or scheduled dimming (Correct answer)
- Photocell calibration
- GFCI scheduling
Correct answer: Time-based dimming or scheduled dimming
Time-based (scheduled) dimming allows the system to automatically reduce fixture brightness at a programmed hour, such as dimming to 30% after midnight for energy savings.
LLC Lighting Control Systems & Automation 2
What does 'dimming capability' in a landscape lighting transformer allow an installer to do?