Practice Test Geeks(CLC) Certified Lighting Consultant Practice Test
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Commercial & Retail Lighting 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 Commercial & Retail Lighting flashcards as text

  1. A commercial lighting audit reveals luminaires have a light loss factor (LLF) of 0.72. What does this mean for the design illuminance target?

    Answer: The initial installed illuminance must be higher to ensure maintained levels remain adequate after depreciation

    An LLF of 0.72 means the system will deliver only 72% of initial lumen output at end of the maintenance cycle, so the initial design must compensate with higher initial illuminance.

  2. In a conference room, which color temperature is generally recommended to support alertness during presentations?

    Answer: 4000–5000K (neutral to cool white)

    Neutral to cool white (4000–5000K) supports alertness and concentration, making it suitable for meeting rooms and presentation spaces where focus is required.

  3. What is the recommended maintained illuminance level for a typical retail checkout counter (cashier task area) per IESNA guidelines?

    Answer: 500 lux (50 fc)

    IESNA recommends approximately 500 lux (50 fc) for retail transaction areas to support accurate cash handling, receipt reading, and card terminal use.

  4. A fashion retailer specifies 'wall washing' for vertical merchandise displays. What does wall washing accomplish?

    Answer: Creates even vertical illuminance to evenly light merchandise hung on display walls

    Wall washing uses precisely spaced luminaires to deliver uniform illuminance across vertical surfaces, ensuring displayed merchandise is evenly lit without scalloping or hot spots.

  5. When designing lighting for a commercial art gallery, which approach best preserves artwork while achieving good visual quality?

    Answer: Low-UV, high-CRI LED with controlled lux levels to minimize photodegradation

    LED sources produce minimal UV and infrared radiation; combined with high CRI and carefully controlled lux exposure levels, they protect sensitive artwork from photodegradation.

  6. In a large commercial retail space using automated lighting controls, what is 'demand response' lighting?

    Answer: Temporarily reducing lighting power on command from the utility during peak demand periods

    Demand response allows the utility or building management system to temporarily reduce lighting power during grid peak demand events, often in exchange for incentive payments.

  7. A retail store switches from 400W metal halide high-bays to 150W LED high-bays while maintaining the same footcandle levels. What is the approximate energy reduction percentage?

    Answer: 62.5%

    Reducing from 400W to 150W is a reduction of 250W, which is 250/400 = 62.5% less energy consumed per fixture.