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  1. Light
  2. Daylight modeling

Daylight modeling

Features/Light/Feature 62

Daylight modeling

Intent: 

To support circadian and psychological health by setting thresholds for indoor sunlight exposure.

62: Daylight modeling
    Post Date: 01 May, 2019
    Status: Approved

    To meet Feature 62 Part 1, Daylight Modeling, complete the following:
    -Meet Feature 56- Solar Glare control
    -Achieve sDA300/50% for at least 55% of area, basing calculations on daylight hours (instead of regularly occupied hours) as outlined in CEN 17037:2018, Annex A
    Post Date: 15 Aug, 2018
    Status: Approved

    Projects may meet the requirements of Feature 62 Part 1b by using the results of daylight modeling to identify and install shading systems to allow the appropriate amount of light into the space. Note that the daylight modeling report submitted must take into account the shades to calculate the light levels in the space during the course of the day.
    Post Date: 24 Oct, 2016
    Status: Approved

    As an alternative to a lighting simulation to determine the sDA of the space, project teams may use the LEED v4 BD+C EQ Daylight Credit (Option 2 or Option 3) requirements to fulfill the requirement. The provided lighting analysis document must be updated to demonstrate that 90% for Option 2 or 75% for Option 3 of the regularly occupied floor area meets the requirements (i.e., at least 2 points under LEED v4 BD+C EQ Daylight credit).
    Post Date: 06 May, 2016
    Status: Not Approved

    Inquiry: Can an automatic shading system that draws shades when sensors indicate that daylight can contribute to glare at workstations be used in lieu of meeting the feature requirements?

    Ruling: No, the installation of automated shading devices alone does not meet the feature requirements, as this feature requires demonstration that as a result of the overall lighting design, the project is able to achieve the proper amount of daylighting.