is
for implementation of proper daylighting design that reduces energy
usage for electric lighting by 50 to 80%, provides occupants a
connection between indoor spaces and the outdoors, and increases
occupant productivity with reduced illness and absenteeism.
OPTION 1 - Glazing Factor Calculation: Complete the Glazing factor
calculation specified in the LEED reference guide to prove a
minimum 2% glazing factor is achieved in 75% of all regularly
occupied areas.
OPTION 2 - Daylight Simulation Model: Create a computer simulation
demonstrating a minimum daylight illumination level of 25
footcandles in at least 75% of all regularly occupied areas.
OPTION 3 - Daylight Measurement: Record indoor light measurements
that prove a minimum daylight illumination level of 25 footcandles
in at least 75% of regularly occupied areas.
- Use of effective solar control strategies (overhangs) and high
performance glazings limit associated solar gains.
- Achieving this daylight credit will likely increase energy
savings in the Energy and Atmosphere credits. This is largely due
to savings in the electric lighting that results from well daylit
spaces.
- Daylighting strategies can have synergies with other energy
efficiency strategies such as displacement ventilation.
- The USGBC calculation methods (requiring a two percent daylight
factor) can require prohibitively high interior illuminance levels
in climates with high exterior illuminance levels.
- Exclude spaces where tasks would be hindered by the use of
daylight, e.g., photography dark rooms and x-ray viewing
rooms.
- Daylight glazing (above 7'-6") offers the most benefit for
harvesting daylight deeper into the space (although they do not
count towards IEQc8.2).
- This credit may have synergies with the lighting control
strategies required in IEQc6.1 and IEQc6.2.
- Consider non-tangible benefits of increased daylighting design,
including increased productivity, decreased absenteeism and errors,
reduced salaries for appealing work environments, etc.
- 58% of all California LEED Certified projects achieved this
credit for LEED v2.1.
Additional EDR Resources
Software:
SkyCalc
Case Studies: High Quality Learning Environment Yields 38 Percent
Energy Savings
Case Studies: Multi-Agency Library Benefits from Daylighting
Strategies
Case Studies: An Integrated Campus Benefits From Its Desert
Environment
Case Studies: Skylighting Helps a Manufacturing Company Retain
Employees
Case
Studies: Skylighting in Schools - A Healthy Advantage
Design Briefs:
Daylighting
Design
Briefs: Glazing
Design Briefs: Building
Simulation
Design
Guidelines: Daylighting Guidelines
Design
Guidelines: Skylighting Guidelines
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