光 Light

For All Spaces except Dwelling Units: Option 1: Daylight simulation The project demonstrates, through computer simulations, that one of the following conditions are achieved: a. Regularly occupied spaces achieve one of the following targets: Calculations per IES LM-83-12 Calculations per Annex A of CEN 17037:2018 Average sDA 200,40% is achieved OR Target illuminance 19 fc(200 lux) is achieved for for > 30% of regularly occupied >30% of individual unit area throughout 50% of daylit floor area hours of the year b. Common spaces that have unassigned seating for at least 15% of regular occupants at any given time achieve one of the following targets: Calculations per IES LM- Calculations per Annex A of CEN 17037:2018 83-12 Average sDA 300,50% is OR Target illuminance 28 fc(300 lux) is achieved for >30% of individual unit area achieved for > 75% of and average illuminance 9 fc(100 lux) is achieved for >95% of individual unit floor area area throughout 50% of daylit hours of the year OR Option 2: Interior layout One of the following requirements is met: a. At least 30% of the regularly occupied area is within a 20 ft(6 m) horizontal distance of envelope glazing in each floor and/or in each individual unit. b. Common spaces have unassigned seating and can accommodate at least 15% of regular occupants at any given time. At least 70% of all seating in the spaces is within a 16 ft(5 m) horizontal distance of envelope glazing. OR Option 3: Building design One of the following requirements is met: a. The envelope glazing area is no less than 7% of the floor area for each floor level or individual unit. b. The floor plate is no more than 65 ft(20 m) between opposite walls that each have transparent envelope glazing, and there are no opaque obstructions higher than 3.2 ft(1 m) within a 20 ft(6 m) horizontal distance of the transparent envelope glazing. OR Option 4: Circadian lighting design The following requirement is met: a. The project achieves at least one point in Feature L03: Circadian Lighting Design. For Dwelling Units: Option 1: Daylight simulation The project demonstrates, through computer simulations, that the following requirement is achieved: a. One of the following targets are met in each dwelling unit: Calculations per IES LM-83-12 Calculations per Annex A of CEN 17037:2018 Average sDA 200,40% is achieved for > OR Target illuminance 19 fc(200 lux) is achieved for >30% 30% of regularly occupied floor area of individual unit area throughout 50% of daylit hours of the year OR Option 2: Facade design The following requirement is met: a

For All Spaces except Dwelling Units: Option 1: Visual lighting design The following requirements are met: a. All indoor and outdoor spaces (including transition areas) comply with the illuminance thresholds specified in one of the following lighting reference guidelines: 1. IES Lighting Handbook 10th Edition.3 2. EN 12464-1: 2011.4 3. ISO 8995-1:2002(E) (CIE S 008/E:2001).5 4. GB50034-2013.6 5. CIBSE SLL Code for Lighting.7 b. The illuminance thresholds take into consideration the tasks and the age groups of the occupants. OR Option 2: Predetermined light levels The following requirements are met: a. More than 50% of the occupants are under the age of 65. b. At least 90% of the project area is comprised of the following space types and meets the associated illuminance thresholds: 1. Offices and classrooms: minimum 30 fc(320 lux) at task surface.8 2. Lobby, atrium and transition (including corridor and outdoor pathways): minimum 10 fc(110 lux) at floor level.8 3. Storage spaces: minimum 10 fc(110 lux) at floor level.8 4. Dining, Lounge and Restrooms: minimum 10 fc(110 lux) at task surface.8 For Dwelling Units: Option 1: Promote Visual Acuity The following requirements are met: a. Lighting is installed in kitchens and bathrooms to comply with the illuminance thresholds specified in one of the following lighting reference guidelines: 1. IES Lighting Handbook 10th Edition.3 5 2. ISO 8995-1:2002(E) (CIE S 008/E:2001).5 3. GB50034-2013.6 4. CIBSE SLL Code for Lighting.7 b. For spaces where lighting is not installed, the following is provided to all tenants: 1. Illuminance thresholds for common tasks conducted in spaces 2. Specifications, quantity and location of light fixtures required to meet light levels based on sample layout Note: Multifamily residential projects may achieve WELL Certification at the Bronze or Silver level without testing in dwelling units, but cannot achieve Gold or Platinum without testing in dwelling units. See Sampling Rates for Multifamily Residential in the WELL Performance Verification Guidebook for further details. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces, which requires access to at least 10% of leased space for testing (identified by the project). References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/0

WELL Certification: 3 Pt | WELL Core: 4 Pt For All Spaces except Dwelling Units: For workstations used during the daytime, electric lighting is used to achieve the following thresholds: a. The following light levels are achieved for at least four hours (beginning by noon at the latest) at a height of 18 in(45 cm) above the work-plane for all workstations in regularly occupied spaces: Threshold Threshold for Projects with Points Enhanced Daylight At least 150 EML OR The project achieves at least 120 EML [109 M- 1(2 [136 M-EDI(D65)] EDI(D65)] and L05 Part 1 or L06 Part 1 ) At least 240 EML OR The project achieves at least 180 EML [163 M- 3(4) [218 M-EDI(D65)] EDI(D65)] and L05 Part 1 or L06 Part 1 b. The light levels are achieved on the vertical plane at eye level to simulate the light entering the eye of the occupant. For Dwelling Units: The following requirements are met in each dwelling unit: a. Electric lighting is used to achieve the following light levels: Threshold Threshold for Projects Points with Enhanced Daylight At least 150 EML OR The project achieves at least 120 EML [109 M-EDI(D65)] and 1 [136 M- at least 2 points in Feature L05: Enhanced Daylight Access EDI(D65)] At least 240 EML OR The project achieves at least 180 EML [163 M-EDI(D65)] and 3 [218 M- at least 2 points in Feature L05: Enhanced Daylight Access. EDI(D65)] b. The light levels are dimmable. If automated lighting is used, it is automatically dimmed after 8:00 pm. c. The light levels are achieved in living rooms and kitchens at a height of 55 in(140 cm) in the center of the room. If workstations are present, light levels are achieved at a height of 18 in(45 cm) above the work-plane. WELL Core Guidance: Meet these requirements in the whole building. Projects must have access to at least 10% of leased space for testing (as identified by the project). In tenant areas, if a sample furniture layout with workstations is not available, light levels must be achieved in the center of the room at a height of 140 cm [55 in]. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light a

WELL Certification: 2 Pt | WELL Core: 1 Pt For All Spaces except Industrial: Option 1: Luminaire considerations Each luminaire meets one of the following requirements for regularly occupied spaces at light output representative of regular use conditions. Wall wash fixtures and concealed fixtures, installed as specified by manufacturer’s data, as well as decorative fixtures may be excluded from meeting these requirements: a. 100% of light is emitted above the horizontal plane. b. Classified with Unified Glare Rating (UGR) of 16 or lower. c. Luminance that does not exceed 6,000 cd/m2 at any angle between 45 and 90 degrees from nadir. OR Option 2: Space considerations The following requirement is met in all regularly occupied spaces: a. Unified Glare Rating (UGR) of 16 or lower. For Industrial: Option 1: Luminaire considerations Each luminaire meets one of the following requirements for regularly occupied spaces (wall wash fixtures and concealed fixtures, installed as specified by manufacturer’s data, as well as decorative fixtures may be excluded from meeting these requirements): a. Meets requirements in All Spaces except Industrial Spaces. b. Unified Glare Rating (UGR) of 19 or lower. OR Option 2: Space considerations The following requirement is met in all regularly occupied spaces: a. Unified Glare Rating (UGR) of 19 or lower. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet requirements in leased spaces. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/07420528.2015.1073158 4. Challet E, Kalsbeek A. Circadian Rhythms and Metabolism. 2017. doi:10.3389/978-2-88945-282-8 5. Plano SA, Casiraghi LP, Moro PG, Paladino N, Golombek DA, Chiesa JJ. Circadian and metabolic effects of light: Implications in weight homeostasis and health. Front Neurol. 2017;8(OCT):558. doi:10.3389/fneur.2017.00558 6. Fonken LK, Nelson RJ. The effects of light at night on circadian clocks and metabolism. Endocr Rev. 2014;35(4):648-670. doi:10.1210/er.2013-1051 7. Boyce P, Barriball E. Circadian rhythms and depression. Aust Fam Physician. 2010;39(5):307-310. https://www.ncbi.nlm.nih.gov/pubmed/20485718. 8. Germain A, Kupfer DJ. Circadian rhythm disturbances in depression. Hum Psychopharmacol. 2008;23(7):571- 585. doi:10.1002/hup.964 9. Hurley S, Goldberg D, Nelson D, et al. Light at night and breast cancer risk among california teachers. Epidemiology. 2014;25(5):697-706. doi:10.1097/EDE.0000000000000137 10. Li Q, Zheng T, Holford TR, Boyle P, Zhang Y, Dai M. Light at night and breast cancer risk: r

WELL Certification: 2 Pt | WELL Core: 3 Pt For All Spaces except Dwelling Units: The following requirement is met: a. One of the following requirements is met for interior daylight exposure: Interior Layout Façade Design Points 70% of all workstations are within 25 ft(7.5 OR Envelope glazing is no less than 15% of the 1(2 ) m) of transparent envelope glazing. Visible regularly occupied floor area or individual unit. light transmittance (VLT) is greater than Visible light transmittance (VLT) of windows is 40%. greater than 40%. 70% of all workstations are within 16 ft(5 m) OR Envelope glazing is no less than 25% of the 2(3) of transparent envelope glazing. Visible light regularly occupied floor area or individual unit. transmittance (VLT) is greater than 40%. Visible light transmittance (VLT) of windows is greater than 40%. For Dwelling Units: The following requirement is met: a. One of the following requirements is met in each dwelling unit: Vertical Envelope Glazing Requirements Points Vertical envelope glazing is no less than 15% of each dwelling unit. Visible light transmittance (VLT) is 1 greater than 40% Vertical envelope glazing is no less than 25% of each dwelling unit. Visible light transmittance (VLT) is 2 greater than 40% WELL Core Guidance: Meet these requirements in the whole building.

WELL Certification: 2 Pt | WELL Core: 3 Pt For All Spaces: The following requirements are met in regularly occupied spaces: a. All vertical transparent envelope glazing has shading that meet one of the following: Type of Shading Points Manual shading controllable by occupants at all times. Shades are regularly opened once a day for all 1(2 ) days that the project is in use Shading is automated to prevent glare 2(3) WELL Core Guidance: Meet these requirements in the whole building. Projects can either install shading in tenant spaces or provide a budget to tenants tied to the implementation of feature requirements. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/07420528.2015.1073158 4. Challet E, Kalsbeek A. Circadian Rhythms and Metabolism. 2017. doi:10.3389/978-2-88945-282-8 5. Plano SA, Casiraghi LP, Moro PG, Paladino N, Golombek DA, Chiesa JJ. Circadian and metabolic effects of light: Implications in weight homeostasis and health. Front Neurol. 2017;8(OCT):558. doi:10.3389/fneur.2017.00558 6. Fonken LK, Nelson RJ. The effects of light at night on circadian clocks and metabolism. Endocr Rev. 2014;35(4):648-670. doi:10.1210/er.2013-1051 7. Boyce P, Barriball E. Circadian rhythms and depression. Aust Fam Physician. 2010;39(5):307-310. https://www.ncbi.nlm.nih.gov/pubmed/20485718. 8. Germain A, Kupfer DJ. Circadian rhythm disturbances in depression. Hum Psychopharmacol. 2008;23(7):571- 585. doi:10.1002/hup.964 9. Hurley S, Goldberg D, Nelson D, et al. Light at night and breast cancer risk among california teachers. Epidemiology. 2014;25(5):697-706. doi:10.1097/EDE.0000000000000137 10. Li Q, Zheng T, Holford TR, Boyle P, Zhang Y, Dai M. Light at night and breast cancer risk: results from a population based case control study in Connecticut, USA. 2010;21(12):2281-2285. doi:10.1007/s10552-010- 9653-z 11. Pickard GE, Sollars PJ. Intrinsically photosensitive retinal ganglion cells. Rev Physiol Biochem Pharmacol. 2012;162:59-90. doi:10.1007/112_2011_4 12. Skeldon AC, Phillips AJK, Dijk D-J. The effects of self-selected light-dark cycles and social constraints on human sleep and circadian timing: a modeling approach. Sci Rep. 2017;7(February):45158. doi:10.1038/srep45158 13. Buxton OM, L’Hermite-Balériaux M, Turek FW, van Cauter E. Daytime naps in darkness phase shift the human circadian rhythms of melatonin and

WELL Certification: 2 Pt | WELL Core: 3 Pt For All Spaces except Dwelling Units: The project demonstrates, through computer simulations, that the following conditions are achieved: a. Regularly occupied spaces achieve one of the following targets: Calculations per IES LM-83-12 Calculations per Annex A of CEN 17037:2018 Points Average sDA300,50% is achieved OR Target illuminance of 28 fc(300 lux) is achieved for >50% of 1(2 ) for > 55% of regularly occupied individual unit area throughout 50% of daylit hours of the floor area year Average sDA300,50% is achieved OR Target illuminance of 28 fc(300 lux) is achieved for >50% of 2(3) for > 75% of regularly occupied individual unit area and average illuminance 9 fc(100 lux) is floor area achieved for >95% of individual unit area throughout 50% of daylit hours of the year For Dwelling Units: The project demonstrates, through computer simulations, that the following conditions are achieved: a. Each dwelling unit achieves one of the following targets: Calculations per IES LM- Calculations Points 83-12 per Annex A of CEN 17037:2018 Average sDA 300,50% is OR Target illuminance 28 fc(300 lux) is achieved for >50% of 1 achieved for > 55% of the individual unit area throughout 50% of daylit hours of the year regularly occupied floor area Average sDA 300,50% is OR Target illuminance 28 fc(300 lux) for >50% of individual unit 2 achieved for > 75% area and average illuminance 9 fc(100 lux) is achieved for >95% of the regularly of individual unit area throughout 50% of daylit hours of the occupied floor area year WELL Core Guidance: Meet these requirements in the whole building. If finishes have not finalized may use the following default surface reflectances: Ceilings: 80% Floors: 20% Walls: 50% The entire floorplate, except circulation areas in non-leased spaces, is to be considered regularly occupied. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int

WELL Certification: 1 Pt | WELL Core: 0.5 Pt For All Spaces: Option 1: Parameters for visual balance Ambient lighting in all regularly occupied spaces meets at least three of the following requirements: a. Horizontal and vertical luminance contrast ratios for an ambient light system is no more than 10 between adjacent independently controlled zones. b. Illuminance uniformity ratio of at least 0.4 or 1:2.5 (minimum light level: average light level) is achieved on any horizontal task plane within a space. c. Automatic changes in lighting characteristics, such as light levels, changes in color and distribution take place over a period of 10 minutes. d. The Correlated Color Temperature (CCT) in each room for similar fixtures is consistent (±200 K) at any point of time. OR Option 2: Design for visual balance Lighting is designed by a lighting professional and takes into account the following considerations: a. Luminance ratios on vertical and horizontal adjacent zones. b. Illuminance uniformity on horizontal task planes. c. Changes in lighting characteristics, such as light levels, changes in color and distribution. d. Color temperature of lights used. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/07420528.2015.1073158 4. Challet E, Kalsbeek A. Circadian Rhythms and Metabolism. 2017. doi:10.3389/978-2-88945-282-8 5. Plano SA, Casiraghi LP, Moro PG, Paladino N, Golombek DA, Chiesa JJ. Circadian and metabolic effects of light: Implications in weight homeostasis and health. Front Neurol. 2017;8(OCT):558. doi:10.3389/fneur.2017.00558 6. Fonken LK, Nelson RJ. The effects of light at night on circadian clocks and metabolism. Endocr Rev. 2014;35(4):648-670. doi:10.1210/er.2013-1051 7. Boyce P, Barriball E. Circadian rhythms and depression. Aust Fam Physician. 2010;39(5):307-310. https://www.ncbi.nlm.nih.gov/pubmed/20485718. 8. Germain A, Kupfer DJ. Circadian rhythm disturbances in depression. Hum Psychopharmacol. 2008;23(7):571- 585. doi:10.1002/hup.964 9. Hurley S, Goldberg D, Nelson D, et al. Light at night and breast cancer risk among california teachers. Epidemiology. 2014;25(5):697-706. doi:10.1097/EDE.0000000000000137 10. Li Q, Zheng T, Holford TR, Boyle P, Zhang Y, Dai M. Light at night and breast cancer risk: results from a population based case control study in Connecticut, USA. 2010;21(12):2281-2285. doi:10.1007/s10552-010- 9653-z 11. Pickard G

WELL Certification: 1 Pt | WELL Core: 0.5 Pt For All Spaces except Circulation Areas: All luminaires (except decorative fixtures, emergency lights and other special-purpose lighting) meet at least one of the following color rendering requirements. If tunable white lighting is used, the requirements are met at 1,000K intervals from the lower end (with a minimum of 2,700K) to the higher end (with a maximum of 5,000k): a. CRI ≥90. b. CRI ≥ 80 with R9 ≥ 50. c. IES Rf ≥ 78, IES Rg ≥ 100, -1% ≤ IES Rcs,h1 ≤ 15%. For Circulation Areas: All luminaires (except decorative fixtures, emergency lights and other special-purpose lighting) meet at least one of the following color rendering requirements: a. CRI ≥ 80. b. IES Rf ≥ 75, IES Rg ≥ 95, -7% ≤ IES Rcs,h1 ≤ 15%. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces.

WELL Certification: 2 Pt | WELL Core: 1 Pt For All Spaces: All luminaires, in combination with the appropriate controls (except decorative lights, emergency lights and other special-purpose lighting), used in regularly occupied spaces meet at least one of the following flicker requirements: a. Classified as “reduced flicker operation” per California Title 24, when tested according to the requirements in Joint Appendix JA-10.8 b. Recommended practices 1, 2 or 3 as defined by IEEE standard 1789-2015 LED.9 c. Pst LM ≤ 1.0 and SVM ≤ 1.6 for indoor applications per NEMA 77-2017.10,11 WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/07420528.2015.1073158 4. Challet E, Kalsbeek A. Circadian Rhythms and Metabolism. 2017. doi:10.3389/978-2-88945-282-8 5. Plano SA, Casiraghi LP, Moro PG, Paladino N, Golombek DA, Chiesa JJ. Circadian and metabolic effects of light: Implications in weight homeostasis and health. Front Neurol. 2017;8(OCT):558. doi:10.3389/fneur.2017.00558 6. Fonken LK, Nelson RJ. The effects of light at night on circadian clocks and metabolism. Endocr Rev. 2014;35(4):648-670. doi:10.1210/er.2013-1051 7. Boyce P, Barriball E. Circadian rhythms and depression. Aust Fam Physician. 2010;39(5):307-310. https://www.ncbi.nlm.nih.gov/pubmed/20485718. 8. Germain A, Kupfer DJ. Circadian rhythm disturbances in depression. Hum Psychopharmacol. 2008;23(7):571- 585. doi:10.1002/hup.964 9. Hurley S, Goldberg D, Nelson D, et al. Light at night and breast cancer risk among california teachers. Epidemiology. 2014;25(5):697-706. doi:10.1097/EDE.0000000000000137 10. Li Q, Zheng T, Holford TR, Boyle P, Zhang Y, Dai M. Light at night and breast cancer risk: results from a population based case control study in Connecticut, USA. 2010;21(12):2281-2285. doi:10.1007/s10552-010- 9653-z 11. Pickard GE, Sollars PJ. Intrinsically photosensitive retinal ganglion cells. Rev Physiol Biochem Pharmacol. 2012;162:59-90. doi:10.1007/112_2011_4 12. Skeldon AC, Phillips AJK, Dijk D-J. The effects of self-selected light-dark cycles and social constraints on human sleep and circadian timing: a modeling approach. Sci Rep. 2017;7(February):45158. doi:10.1038/srep45158 13. Buxton OM, L’Hermite-Balériaux M, Turek FW, van Cauter E. Daytime naps in darkness phase shift the human circadian rhythms of melatonin and thyrotropin secretion. Am J Physiol Integr Comp Physiol. 2000;278(2):R373- R382.

WELL Certification: 2 Pt | WELL Core: 1 Pt For All Spaces: Option 1: Lighting zones Ambient lighting systems meet the following requirement: a. All regularly occupied spaces contain lighting zones as shown in the table below (note: individual rooms smaller than the areas below and/or that have occupancies less than those listed in the table are considered separate zones): Number of Zones Number of Zones Points One per 650 ft2(60 m2) OR One per 10 occupants 1(0.5 ) One per 320 ft2(30 m2) OR One per 5 occupants 2(1) Option 2: Lighting control system Each lighting zone meets the following requirements: a. Lighting systems have at least three lighting levels or scenes that allow for changes in light levels and have the ability to change at least one of the following: 1. Color. 2. Color temperature. 3. Distribution of light by controlling different groups of lights or through preset scenes. b. All regular occupants have control over their immediate lighting environment through at least one of the following: 1. Manual controls (e.g. switches or control panels) located in the same space as each lighting zone. 2. Digital interface available on a computer or phone. c. Lighting for presentation or projection walls are separately controlled. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces.

WELL Certification: 1 Pt | WELL Core: 0.5 Pt For All Spaces except Dwelling Units: Option 1: Supplemental lighting requirements The following requirements are met: a. Occupants are provided supplemental lighting, the light fixtures provided increase the light level on the task surface to at least twice the recommended light levels based on the reference used to meet Feature L02: Visual Lighting Design, Part 1. b. The supplemental light fixture is positioned to create minimal visual discomfort for the occupant or per manufacturer recommendations for installation. c. The supplemental light fixture is installed at least 9 in(23 cm) from the front edge of the workstation or other work surface (horizontal distance) or per manufacturer's instructions. Option 2: Supplemental lighting availability The following requirements are met: a. Supplemental light fixtures are provided to occupants upon request at no cost. Requests are fulfilled within eight weeks. b. At least one supplemental light fixture is available to occupants for trial purposes. WELL Core Guidance: Meet these requirements in non-leased spaces. To earn an additional point, also meet these requirements in leased spaces. References 1. Legates TA, Fernandez DC, Hattar S. Light as a central modulator of circadian rhythms, sleep and affect. Nat Rev Neurosci. 2014;15(7):443-454. doi:10.1038/nrn3743 2. 2Czeisler CA, Gooley JJ. Sleep and circadian rhythms in humans. Cold Spring Harb Symp Quant Biol. 2007;72:579-597. doi:10.1101/sqb.2007.72.064 3. Cho Y, Ryu S-H, Lee BR, Kim KH, Lee E, Choi J. Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment. Chronobiol Int. 2015;32(9):1294-1310. doi:10.3109/07420528.2015.1073158 4. Challet E, Kalsbeek A. Circadian Rhythms and Metabolism. 2017. doi:10.3389/978-2-88945-282-8 5. Plano SA, Casiraghi LP, Moro PG, Paladino N, Golombek DA, Chiesa JJ. Circadian and metabolic effects of light: Implications in weight homeostasis and health. Front Neurol. 2017;8(OCT):558. doi:10.3389/fneur.2017.00558 6. Fonken LK, Nelson RJ. The effects of light at night on circadian clocks and metabolism. Endocr Rev. 2014;35(4):648-670. doi:10.1210/er.2013-1051 7. Boyce P, Barriball E. Circadian rhythms and depression. Aust Fam Physician. 2010;39(5):307-310. https://www.ncbi.nlm.nih.gov/pubmed/20485718. 8. Germain A, Kupfer DJ. Circadian rhythm disturbances in depression. Hum Psychopharmacol. 2008;23(7):571- 585. doi:10.1002/hup.964 9. Hurley S, Goldberg D, Nelson D, et al. Light at night and breast cancer risk among california teachers. Epidemiology. 2014;25(5):697-706. doi:10.1097/EDE.0000000000000137 10. Li Q, Zheng T, Holford TR, Boyle P, Zhang Y, Dai M. Light at night and breast cancer risk: results from a population based case control study in Connecticut, USA. 2010;21(12):2281-2285. doi:10.1007/s10552-010- 9653-z 11. Pickard GE, Sollars PJ. Intrinsically photosensitive retinal ganglion cells. Rev Physiol Biochem Pharmacol. 2012;162:59-9