Circadian emulation
P3. Circadian emulation
Many animals evolved to adapt to the diurnal cycle by using light as a cue for activity and rest. Subtle changes in light quality over the day help modulate the intensity of activity, levels of alertness and preparation for sleep.
This feature manages the spectral power distribution of light over the day to more closely resemble the solar cycle. The power of home lighting can be strengthened by automating the selection of light type according to the time of day. This feature uses the equivalent melanopic lux unit defined earlier in this chapter.
Part 1: Window Sizes for Working and Learning Spaces
The following conditions are met:
a. Window-wall ratio as measured on external elevations is between 20% and 60%. Percentages greater than 40% require external shading or intelligent glazing to control unwanted heat gain and glare.
b. Between 40% and 60% of window area is at least 7 feet above the floor (Daylight Glass).
Part 2: Dawn Simulation
In all bedrooms, the lighting system or a standalone device meets the following requirements:
a. Allow users to set a "wake time".
b. Gradually increases light (as measured at the bed, viewing the light) from 0 to at least 250 equivalent melanopic lux over the course of 15 minutes or longer.
Applicability Matrix
| Core & Shell | Tenant Improvement | New Construction | |
|---|---|---|---|
| Part 1: Window Sizes for Working and Learning Spaces | O | O | O |
| Part 2: Dawn Simulation | - | - | - |
| Commercial Kitchen | Schools | Multifamily Residential | Restaurant | Retail | |
|---|---|---|---|---|---|
| Part 1: Window Sizes for Working and Learning Spaces | O | O | - | O | O |
| Part 2: Dawn Simulation | - | - | O | - | - |
Verification Methods Matrix
| Letters of Assurance | Annotated Documents | On-Site Checks | |
|---|---|---|---|
|
PART 1 (Design) Window Sizes for Working and Learning Spaces |
Architectural Drawing | Spot Check | |
|
PART 2 (Design) Dawn Simulation |
Architect |