CLC Human Centric Lighting & Wellness 3

Question 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?

Accepted Answer

S-cone

Answer

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

Question 2

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

Accepted Answer

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

Answer

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.

Question 3

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

Accepted Answer

Greater circadian effectiveness per photopic lumen

Answer

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

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

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

Answer

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.

(CLC) Certified Lighting Consultant Practice Test

(CLC) Certified Lighting Consultant Practice Test

CLC Human Centric Lighting & Wellness 3