Light elimination
- 53 Visual lighting design
- 54 Circadian lighting design
- 55 Electric light glare control
- 56 Solar glare control
- 57 Low-glare workstation design
- 58 Color quality
- 59 Surface design
- 60 Automated shading and dimming controls
- 61 Right to light
- 62 Daylight modelling
- 63 Daylighting fenestration
- 202 Light elimination
- 203 Nightlights
- 204 Circadian emulation
P2. Light elimination
Light is the primary zeitgeber, the signal by which the body aligns its internal clock with the external environment. Therefore light at night is a potential hazard as it can disrupt circadian rhythm. It blurs the distinction between day and night, and affects the timing of the sleep wake cycle.
This feature ensures that no external sources, devices or electrical features create light at night in a sleeping area.
Part 1: Window Light Elimination
In all bedrooms windows, one of the following is met:
a) Blackout shades with 0% transmittance and no light gaps on the perimeter.
b) Operable outdoor shutters with 0% transmittance.
Part 2: Electric Light Elimination
In all bedrooms, the following are met:
a) All electronics have an option to produce no light.
Part 3: Exterior Lighting
All outdoor lamp posts:
a) Emit no light above the horizontal plane.
b) Use shielding so that the angle of viewing is not less than 60°.
Applicability Matrix
| Core & Shell | New Construction | WELL Interiors | |
|---|---|---|---|
| Part 1: Window Light Elimination | - | - | - |
| Part 2: Electric Light Elimination | - | - | - |
| Part 3: Exterior Lighting | - | - | - |
| Commercial Kitchen | Education | Multifamily Residential | Retail | |
|---|---|---|---|---|
| Part 1: Window Light Elimination | - | - | O | - |
| Part 2: Electric Light Elimination | - | - | O | - |
| Part 3: Exterior Lighting | - | - | O | - |
Verification Methods Matrix
| Letters of Assurance | Annotated Documents | On-Site Checks | |
|---|---|---|---|
|
PART 1 () Window Light Elimination |
Auditor Inspection | ||
|
PART 2 () Electric Light Elimination |
Auditor Inspection | ||
|
PART 3 (Performance) Exterior Lighting |
Architect | Letter of Assurance |