Daylight is available over
4400 hours in a year, all day, every day - even in rainy, cloudy weather.
The renewable source of all daylight is the Sun, providing over
8,8 10 7 lm/m2 annual illuminance free of charge.
Daylight provides the highest level of
color-rendering (CRI > 95%) that no electric light source can fully match.
A good daylighting design can
save up to 75% of the energy used for electric lighting in a building.
The daylight provision levels (minimum, medium or high) of the interior spaces of an existing or completed building can be determined with on-site measurements.
This is invaluable information for inhabitants and owners to plan interior renovation or refurbishment; to optimize electric light usage and to provide better indoor environment for the occupants.
The daylight performance of the interiors effects the value of the entire building. Real-estate professionals can use this benchmark to compare properties and deliver more accurate return on investment forecasts.
|EU Standard||ET (ETM) lx||F plane (min) %|
|Minimum||300 (100) lx||50 (95)%|
|Medium||500 (300) lx||50 (95)%|
|High||750 (500) lx||50 (95)%|
Levels of daylight provision by openings in vertical and inclined surfaces (EN 17037 EU Standard).
The availability of direct sunshine is crucial for the brain to maintain the
circadian rhythm - adjust the melatonin levels - and keep the daily schedule for sleep and wakefulness.
Vitamin D supports bone health, blood pressure regulation and
immune system strength - but only if your body is exposed to direct sunshine.
Sunshine helps to lower stress, fight off depression, treat skin conditions, have a good sleep at night and helps to live a
healthier, longer life.
Use passive and active solar heating systems to maximize the amount of solar gain and
reduce heating costs in the cold season.
The duration of direct sunlight throughout the year in an existing building interior can be determined with on-site measurements, using photographs and sun-path diagrams. Based on this information the level of exposure to sunshine for a room (minimum, medium or high) can be determined; and used as input data for renovation planning and real-estate value estimation purposes.
|EU Standard||Sunlight exposure|
Levels for daily sunlight exposure (EN 17037 EU Standard).
To maintain focus on the work - bright sunlight or its reflection
glare on a monitor, desk, board or projector screen must be avoided.
Selecting the right location and
workspace position, adjusting the
viewing direction may help to reduce the unpleasant distractions caused by glare.
Proper use of
shading devices can help to reduce the risk of glare in open offices or co-working spaces where occupants are unable to choose their work position or viewing direction.
Create pleasant and productive work environment with the harmony of lighting, shading, interior décor and
Sunlight - particularly in classrooms and workspaces - can cause serious visual discomfort. Once the sources of glare and its duration is identified, the probability of glare can be minimized.
Modifying the layout and arrangement of workspaces, applying external and internal shading devices and daylight aperture glazing systems can reduce glare and ensure more comfortable work environment for existing buildings as well.
|EU Standard||DGP e < 5%|
Levels of threshold for glare protection (EN 17037 EU Standard).
View of the outside -
visual connection with the exterior - provide information about the local environment, weather changes and the time of the day.
The outside view provides refreshment and relaxation afforded by a change of the
visual field and
focus and helps to relieve the fatigue associated with long periods of indoors stay.
The quality (diversity, number of visible layers) and the characteristics (distance, view angle) of the view out
significantly affects property values.
The view of the outside world has its own, unique qualities; lends a
feeling of security for the occupants that can't be substituted with CCTV security systems.
The quality of the view available from an interior of a flat greatly effects the value of a property. Flats and apartments within the same building may have equal floor area and layout, yet the quality of the offered view may differ greatly.
A wide and distant view is appreciated more than a narrow and near view. A diverse and dynamic view is more interesting than a monotonous view. A view of nature may have positive influence on a person’s sense of wellbeing, and job satisfaction, and people generally prefer to sit near a daylight opening and to look outside.
|EU Standard||Horizontal sight angle||Outside distance||Number of layers|
|Minimum||≥ 14°||≥ 6,00 m||Landscape|
|Medium||≥ 28°||≥ 20,00 m||Landscp+1|
|High||≥ 54°||≥ 50,00 m||All 3 layers|
Levels of view out from a given position (EN 17037 EU Standard).
Daylighting is the controlled admission of natural light (direct sunlight, diffuse skylight) into building interiors through windows, transparent walls, ceilings and skylight openings.
The use of daylight - natural light - saves on electric energy costs, contributes to indoor well-being and health, increases property values and result better return on investment.
Architects can design better quality buildings, utilize more solar energy; owners can improve the quality of interiors; real-estate professionals can achieve better return on investment.
The new European standard considers both quantity and quality aspects of daylight. Provides exact benchmark levels, design and validation methods and metrics for 33 European countries.
The Eropean standard considers four specific fields for daylight assessment in the indoor spaces: daylight provision, exposure to sunlight, glare protection and view out.
This describes the amount and distribution of daylight in the interior, achieving higher levels means that less electric light will be used in the building.
This describes the duration of direct sunlight in the interior, contributes to the well-being and health of occupants, mandatory in kinder gardens, homes and hospitals.
This is necessary to ensure pleasant and comfortable workspaces in schools, offices or at home; when reading, writing or using display devices.
This describes the quality of the view provided through the windows of a room, achieving higher levels influence the market price of the property.
Design better quality buildings,
utilize more renewable energy,
comply with regulations.
Improve the quality of existing indoor spaces for living and working and
save on energy costs.
compare property values,
estimate the expected return on investment.