Lighting Controls & Technologies Flashcards
7 cards from real CLC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Lighting Controls & Technologies flashcards as text
In a DALI-2 system, what distinguishes an 'input device' (such as a push button) from an 'output device' (such as a ballast)?
Answer: Input devices send commands to the bus; output devices receive and execute commands
DALI-2 formalizes input devices as those that generate events or commands on the bus (sensors, switches), while output devices (ballasts, LED drivers) respond by adjusting light levels.
What is the primary function of a lighting control panel's 'relay' as opposed to a 'dimmer module' in a commercial building?
Answer: A relay provides binary on/off switching; a dimmer module provides variable intensity control
Relays provide simple on/off control for non-dimmable loads, while dimmer modules vary voltage or current to allow continuous light level adjustment.
Which occupancy sensor placement strategy is BEST for a large open-plan office to avoid dead zones?
Answer: Multiple ceiling-mounted ultrasonic sensors with overlapping coverage zones
Overlapping coverage from multiple ceiling-mounted ultrasonic sensors ensures that any movement in the space is detected, eliminating gaps that a single sensor cannot cover.
When integrating LED luminaires with a 0–10V dimmer, why is it important to verify the driver's minimum dim level before commissioning?
Answer: Some LED drivers jump to full off below a threshold voltage, causing an abrupt step rather than smooth fade
Many 0–10V LED drivers are programmed to shut off when the control voltage drops below a set threshold, producing an undesirable jump-to-black rather than a gradual dim-to-off.
A healthcare facility requires lighting controls that allow nurses to dim patient room lights without leaving the bedside. Which control device BEST satisfies this requirement?
Answer: Wireless handheld remote or bedside touchpad integrated into the nurse call system
A wireless bedside control or nurse call integration gives caregivers immediate, local dimming without stepping away from the patient, meeting both functional and infection-control goals.
Which term describes the ratio of the luminous flux emitted by a luminaire to the luminous flux produced by the lamp(s) inside it?
Answer: Luminaire Efficacy Rating (LER) / Luminaire efficiency
Luminaire efficiency (or LER) quantifies how much of the lamp's raw lumen output actually exits the luminaire, accounting for optical and thermal losses within the fixture.
In California's Title 24 code, what does the term 'mandatory control' refer to for newly installed indoor lighting?
Answer: Controls required regardless of building type or space use, such as automatic shutoff and manual switching
Title 24 mandatory controls are baseline requirements that apply universally—including occupant sensing and automatic shutoff—independent of any prescriptive or performance compliance path.