WORKSHOP – Wellness Real Estate, New Challenges in Healthy Lighting Requirements in the Built Environment
Moderator: Dr. Perez
Dr. Stephen Archer Mason, Optometrist and Managing Director, Sustainable Eye Health Pty
Mag. Wilfried Pohl, R&D Manager, Bartenbach
Francesc Jordana, R&D Lighting Manager, Simon
Wellness real estate, healthy housing, is an emerging trend in the built environment. In this workshop, we will discuss the different lighting requirements in building standards, principally BREEAM, LEED, and WELL, their crosswalks, and their interaction with human well-being, wellness, and ultimately health, with an emphasis in the circadian feature of the WELL Building Standard.
Daylight is recognized in these models as a key factor in the architectural spaces, not only in terms of energy savings, but also and in wellness and well-being benefits for the building occupants. When daylight is poor, or not available, electric/artificial light becomes critical to either supplement daylight, or to fulfill the whole lighting requirements in the built environment.
Beyond classical requirements such as glare and color quality, WELL introduces a unique specific mandatory feature for circadian design, feature 54. This feature brings up a challenging dichotomy for lighting designers and manufacturers: glare avoidance and visual comfort strategies try to avoid high luminance and direct eye exposure to light sources (dark-lighting), but melanopic stimulus at the eye level requires a minimum light illuminance threshold to promote proper psycho-physiological/circadian activations, particularly in the morning.
We introduced at LpS2017 a new metric to evaluate melanopic design efficiency, the ratio between the melanopic vertical illuminance (equivalent melanopic lux, EML in WELL) and horizontal illuminance (Eh in lux). To achieve adequate values of EML, high values of Eh are required with traditional luminaries and traditional lighting design strategies. Besides other issues, this can create potential problems in terms of discomfort, glare, and energy efficiency.
To provide solutions for these new challenges, we will discuss new approaches and strategies in lighting fixtures and lighting design, such as dual emission fixtures, dynamic spectrum emission, full-spectrum LEDs, indirect lighting (high reflective ceiling and walls as part of the lighting system) etc, that will help to overcome current limitations to achieve appropriate EML values without compromising glare minimization and energy efficiency goals.
Finally, we will discuss about WELL v2, expected to be launched in 2018-Q2/Q3. WELL v2 introduces localized metrics and international equivalences to adjust the standard to local regulations. This is of particular relevance for the application of WELL in Europe. CIE is discouraging the use of the melanopic lux, the foundation of the WELL EML, and the Melanopic Equivalent Daylight Illuminance (MEDI,D65) is becoming the metric of choice in the European Union for the melanopic stimulus. The German Commission for Occupational Health and Safety and Standardization, KAN, has expressed it concerns about melanopic lighting and potential health risks. The Blue Light Hazard (BLH) concern, whether real or alarmistic, is a pervasive topic in today’s lighting discussions. We will briefly analyze this rapidly evolving scenario with the aim of providing help and guidance.
Real world pilot installations will be discussed to show the application of the proposed solutions.