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.

Read the first 7 Lighting Controls & Technologies flashcards as text

  1. When commissioning a daylight harvesting closed-loop system, where should the photosensor be aimed to measure the correct work-plane illuminance?

    Answer: Downward toward the work plane, away from direct view of windows

    A closed-loop photosensor must measure the actual illuminance on the work plane, so it faces downward while avoiding direct window glare that would skew readings.

  2. Which wireless lighting control protocol operates in the 2.4 GHz band and is based on IEEE 802.15.4, commonly used in smart building mesh networks?

    Answer: Zigbee

    Zigbee is built on the IEEE 802.15.4 physical and MAC layer standard and operates at 2.4 GHz, forming self-healing mesh networks widely used in commercial smart lighting.

  3. A conference room lighting scene requires 30% ambient light and 80% presentation wall wash. Which control system feature enables storing and recalling this multi-zone combination?

    Answer: Scene preset

    Scene presets store predefined multi-zone dimming levels that can be recalled with a single button press, enabling quick transitions between lighting modes.

  4. What is the key difference between a phase-cut forward phase (TRIAC) dimmer and a reverse phase (electronic low-voltage) dimmer?

    Answer: Forward phase cuts the leading edge of the AC waveform; reverse phase cuts the trailing edge

    TRIAC (forward phase) dimmers chop the leading edge of the AC sine wave, while reverse phase (ELV) dimmers cut the trailing edge, making them better suited for capacitive LED driver loads.

  5. Under IECC 2021, what is the maximum interior lighting power allowance for a general office space using the space-by-space method?

    Answer: 0.98 W/ft²

    IECC 2021 sets the general office LPA at 0.98 W/ft² under the space-by-space method, reflecting continued efficiency improvements over earlier code cycles.

  6. Which feature of a smart lighting gateway enables third-party HVAC and access control systems to respond to lighting occupancy data?

    Answer: API or BACnet/IP data sharing that broadcasts occupancy status to other building systems

    Open APIs and BACnet/IP integration allow the lighting gateway to share real-time occupancy data with HVAC, access control, and other building management systems.

  7. A flicker metric used to evaluate LED driver performance at low dim levels, expressed as a percentage, is best described as which of the following?

    Answer: Percent flicker (modulation depth)

    Percent flicker measures the cyclic variation in light output as (Max−Min)/(Max+Min)×100%, with lower values indicating less perceptible flicker at dim levels.