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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. Which photoreceptor cell in the human eye is primarily responsible for circadian photoentrainment?

    Answer: Intrinsically photosensitive retinal ganglion cells (ipRGCs)

    ipRGCs contain melanopsin and project to the suprachiasmatic nucleus (SCN), making them the primary drivers of circadian photoentrainment.

  2. What is the approximate peak sensitivity wavelength of the melanopsin photopigment?

    Answer: 480 nm

    Melanopsin has a peak spectral sensitivity at approximately 480 nm, in the blue-cyan range of the visible spectrum.

  3. A hospital patient room is being designed for post-surgical recovery. Which daytime CCT range best supports alertness and circadian health?

    Answer: 5000K–6500K

    Higher CCTs (5000K–6500K) provide more blue-enriched light that suppresses melatonin and promotes daytime alertness, supporting circadian health.

  4. Which metric is used by the WELL Building Standard to quantify the circadian stimulus potential of a lighting environment?

    Answer: Equivalent Melanopic Lux (EML)

    The WELL Building Standard uses Equivalent Melanopic Lux (EML) to measure the non-visual, circadian-effective component of a lighting environment.

  5. Evening exposure to high melanopic illuminance primarily causes which physiological effect?

    Answer: Phase delay of the circadian clock

    Evening bright light exposure suppresses melatonin and shifts the circadian clock later, causing a phase delay.

  6. The Circadian Stimulus (CS) metric developed by the Lighting Research Center ranges from 0 to 1. A CS value of 0.3 represents what threshold?

    Answer: Threshold for 50% melatonin suppression after 1 hour

    A CS value of 0.3 corresponds to the threshold for approximately 50% nocturnal melatonin suppression after one hour of exposure.

  7. Which environmental factor, when combined with dynamic lighting, most effectively reinforces circadian entrainment in shift workers?

    Answer: Scheduled meal timing

    Scheduled meal timing is a strong non-photic zeitgeber that, combined with dynamic lighting, powerfully reinforces circadian entrainment in shift workers.