Practice Test Geeks(CLC) Certified Lighting Consultant Practice Test
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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.

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  1. Which ASHRAE/IES Standard 90.1 requirement mandates automatic shutoff controls for lighting in most commercial buildings?

    Answer: Section 9 (Lighting)

    ASHRAE 90.1 Section 9 covers lighting energy efficiency requirements, including mandatory automatic shutoff controls in commercial spaces.

  2. What does the term 'lumen maintenance' refer to in the context of LED driver dimming?

    Answer: The ability of a driver to sustain consistent light output as the LED ages

    Lumen maintenance describes how well a driver or system preserves rated light output over the operational life of the LED source.

  3. In a BACnet/IP integration with a lighting control system, what role does the BACnet object type 'Analog Output' typically serve?

    Answer: Sending a variable setpoint such as a dimming level to a field device

    BACnet Analog Output objects write continuous variable values—like a 0–100% dim command—to controlled devices in the field.

  4. Which color rendering metric better captures the ability of a light source to render saturated colors compared to CRI Ra?

    Answer: IES TM-30 Rf and Rg

    IES TM-30 uses 99 reference samples and reports both fidelity (Rf) and gamut (Rg), providing a more complete color rendering picture than the 8-sample CRI Ra.

  5. A retail store uses tunable white LED fixtures to shift CCT throughout the day. Which human-centric lighting benefit does this PRIMARILY target?

    Answer: Circadian rhythm alignment and alertness regulation

    Tunable white systems shift between warm and cool CCT to mirror the natural daylight cycle, supporting circadian health and alertness in occupants.

  6. What is the purpose of a 'hold-on' time setting in an occupancy sensor controller?

    Answer: It keeps lights on for a set period after the last detected motion before turning them off

    The hold-on (or time delay) setting prevents premature shutoff by maintaining illumination for a specified duration after the sensor last detects movement.

  7. In a Power over Ethernet (PoE) lighting system, what standard governs the maximum power delivery per port for high-power luminaires?

    Answer: IEEE 802.3bt (Type 4, up to 90W)

    IEEE 802.3bt (PoE++) Type 4 delivers up to 90W per port, enabling high-wattage luminaires and additional sensors on a single Ethernet cable.