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. In a retail apparel store, which color rendering index (CRI) minimum is recommended to accurately show fabric colors?

    Answer: CRI 90

    Apparel retail requires CRI 90 or higher so customers can evaluate true fabric colors under conditions similar to natural daylight.

  2. What is 'accent lighting' primarily used for in a retail environment?

    Answer: Highlighting merchandise to draw customer attention

    Accent lighting directs focused beams onto featured products to create visual hierarchy and stimulate purchase intent.

  3. A commercial office space has an average maintained illuminance of 300 lux. According to IESNA recommendations, is this adequate for general office work?

    Answer: No, general office work requires at least 500 lux

    IESNA recommends approximately 500 lux (50 fc) for general office tasks such as reading and computer work.

  4. What is the purpose of a 'layered lighting' strategy in a commercial retail space?

    Answer: To combine ambient, accent, and task lighting for visual interest and function

    Layered lighting integrates ambient, accent, and task layers to serve multiple purposes simultaneously, improving both aesthetics and merchandising effectiveness.

  5. Which lamp type is most susceptible to color shift when dimmed, potentially affecting merchandise appearance in retail stores?

    Answer: Metal halide

    Metal halide lamps experience significant color shift and flicker when dimmed, making them unsuitable for applications requiring consistent merchandise color rendering.

  6. In a supermarket, what lighting technique is commonly used over produce displays to enhance the appearance of fruits and vegetables?

    Answer: Warm white LED with high CRI and targeted beam angles

    Warm white sources (2700–3000K) with CRI 90+ and directional beams make produce look vibrant, fresh, and appetizing to shoppers.

  7. What does 'uniformity ratio' describe in commercial lighting design?

    Answer: The ratio of maximum to minimum illuminance across a surface

    Uniformity ratio (max/min or avg/min illuminance) indicates how evenly light is distributed across a work plane or area.