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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. CIE S 026/E:2018 defines the α-opic action spectra for five photoreceptor types. Which receptor's action spectrum is used to calculate S-cone-opic EDI?

    Answer: S-cone

    S-cone-opic EDI (Equivalent Daylight Illuminance) is calculated using the spectral sensitivity function of the short-wavelength sensitive (S) cone.

  2. An office measures 250 melanopic EDI at the eye. According to WELL v2 L07 Feature, is this sufficient for daytime circadian support?

    Answer: No, WELL v2 requires at least 275 melanopic EDI for 4+ hours

    WELL v2 Feature L07 requires a minimum of 275 melanopic EDI for at least 4 hours per day during daytime work periods to support circadian health.

  3. A lighting designer specifies luminaires with a high S/P ratio. What primary non-visual benefit does this provide?

    Answer: Greater circadian effectiveness per photopic lumen

    A high S/P (scotopic-to-photopic) ratio indicates relatively more short-wavelength content, which provides greater melanopic stimulation per photopic lumen.

  4. Which of the following is a limitation of using Correlated Color Temperature (CCT) alone to specify human centric lighting?

    Answer: Two sources with the same CCT can have very different spectral power distributions and melanopic effects

    Two light sources with identical CCTs can differ significantly in their spectral power distributions and therefore have very different melanopic EDI values.

  5. In a dynamic HCL system, which sequence of color tuning throughout a standard workday best supports circadian alignment?

    Answer: Low CCT morning, peak CCT at midday, decreasing CCT afternoon/evening

    Mimicking natural daylight, HCL systems should start moderate, peak in melanopic stimulation around midday, and taper to warmer, lower-melanopic light in the afternoon/evening.

  6. A neonatal intensive care unit (NICU) implements HCL. What is the primary wellness concern that differentiates NICU lighting from adult HCL applications?

    Answer: Premature infant circadian systems are not yet developed and blue light may cause retinal damage

    Premature neonates have immature circadian systems and underdeveloped retinal protective mechanisms, making them potentially vulnerable to blue light phototoxicity from high melanopic exposures.

  7. The biological day length (photoperiod) is sensed by the SCN primarily through the duration of which hormone's suppression?

    Answer: Melatonin

    The SCN reads photoperiod via the duration of melatonin suppression — longer light exposure suppresses melatonin longer, signaling a longer 'day' to the body.