Circadian lighting design
- 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 modeling
- 63 Daylighting fenestration
- P2 Light at night
- P3 Circadian emulation
Circadian lighting design
To support circadian health by setting a minimum threshold for daytime light intensity.
Please review the Circadian Lighting Appendix L1 and L2 for a detailed account of how circadian lighting can be measured. When modeling, the light level achieved on the occupant's eye can be demonstrated by simulating a proxy wall which is assumed to be positioned in front of the occupant's eye and calculating the light level on the vertical surface of the proxy wall.
To learn more about circadian lighting and how it is measured, please review the Circadian Lighting Appendix L1 and L2.
As a rule of thumb, the required circadian lighting levels may more easily be achieved when specifying high color temperature lamps and light fixtures that display a broader range of the color spectrum as represented by the lamp's spectral power distribution (which can be requested from manufacturers if not already provided). LEDs with higher color temperatures will work better as they meet both of these requirements. That said, other lighting types and temperatures can work as well, depending on how much daylight and/or or task lighting is available to supplement the overhead lighting.
In order to fully verify your lighting strategy, a lighting model that takes into account daylight and/or overhead light should be conducted to ensure that the required light levels are met at all the workstations on the vertical plane where the occupant's eyes would typically be.
A lighting designer is not required to be a part of the project design team, however, they may be helpful if no one on the project team has specific experience with lighting models or with circadian lighting design.
A project is not required to provide EML calculations or modeling; the only documentation required for this feature is a Letter of Assurance from the architect or lighting consultant.
The WELL assessor will verify that the levels are being meet through onsite spot checks of the light levels. Therefore, project teams are strongly encouraged to run their own calculations and to consider modeling so that they are confident they are meeting the lighting levels required of the feature before the WELL assessor comes on site.