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Human Centric Lighting & Wellness 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 Human Centric Lighting & Wellness flashcards as text

  1. The non-visual effects of light include all of the following EXCEPT:

    Answer: Photopic visual acuity improvement

    Photopic visual acuity is a visual (image-forming) function driven by cones, not a non-visual effect; melatonin suppression, pupil response, and alertness are all non-image-forming light effects.

  2. Which body organ contains peripheral circadian clocks that are particularly responsive to meal timing rather than light cues?

    Answer: Liver

    The liver contains robust peripheral circadian oscillators that are primarily entrained by food timing rather than light, making it highly sensitive to meal schedule changes.

  3. A lighting specification calls for 'tunable white' luminaires. What range of CCT adjustment is most useful for a full HCL application?

    Answer: 2700K to 6500K

    A wide CCT range from 2700K (warm, low melanopic) to 6500K (cool, high melanopic) provides the full spectrum needed to transition from relaxing evening settings to maximally alerting daytime conditions.

  4. Seasonal Affective Disorder (SAD) light therapy boxes are typically specified at what illuminance for therapeutic effectiveness?

    Answer: 10,000 lux at 5000K–6500K

    Clinical SAD light therapy protocols call for 10,000 lux of broad-spectrum white light (typically 5000K–6500K) delivered at eye level for 20–30 minutes each morning.

  5. In the context of HCL, what is 'phase response curve' (PRC)?

    Answer: A plot describing how light exposure at different times of day shifts the circadian clock phase

    The phase response curve (PRC) maps the magnitude and direction of circadian clock phase shifts produced by light exposure given at each circadian time, guiding therapeutic lighting timing.

  6. A healthcare lighting designer wants to minimize circadian disruption for nighttime nursing staff. Which lighting strategy is most evidence-based?

    Answer: Using red-shifted, low CCT (1800K–2200K) task lighting during night shifts

    Red-shifted, low-CCT lighting at night minimizes melanopic stimulation, preserving melatonin and reducing circadian disruption for night-shift nurses.

  7. Which emerging HCL metric proposed in research accounts for both the melanopic stimulation and the duration of light exposure, providing a dose-based assessment?

    Answer: Melanopic EDI-hours

    Melanopic EDI-hours integrates melanopic illuminance over time to express the total circadian light dose received, analogous to how UV dose is expressed as UV index-hours.