Glare

Daylight Glare Bibliography

Despite the growing awareness of the need for visual comfort, there is no simple method which can be used to assess all the factors (eg: glare, view, uniformity etc.) affecting visual comfort in daylit offices which are built and occupied. This report basically takes the form of a literature study. It investigates which factors influence visual comfort in daylit offices and how each of these factors can be measured to give an accurate assessment of the visual comfort of the occupants.

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References

References

Aizlewood, Maurice, Measuring the Performance of Advanced Daylighting Systems, Daylighting ’98 Conference Proceedings, 11 – 13 May 1998, Ottawa, Canada

Atif, Morad R, Love, James A, Littlefair, Paul, Daylighting Monitoring Protocols & Procedures for Buildings, A report of Task 21 / Annex 29 Daylight in Buildings October 1997

Bell, James and Burt, William, Designing buildings for Daylight, BRE publication, Crown Research Communications Ltd, London, 1995

Assessment Method for Visual Comfort

This report has been used to lay the foundations for the development of a simple procedure to assess the visual comfort of daylit offices. Within the time constraints an actual document outlining the exact process required was not able to be produced. However, throughout this report suggestions have been made regarding what specific measurements and assessments are necessary in the procedure. The following section discusses the general needs of the procedure.

Format

Glare

Glare is the most widely known and researched cause of visual discomfort in daylit environments. It is also a very difficult phenomenon to measure. Some people are more tolerant of glare conditions than others and the parameters affecting glare will always be different in each office.

Assessment Methods

The critical factors affecting visual comfort

Many of the factors of importance for visual comfort in daylit environments are the same as those for artificially lit environments. However, the direction, quantity, quality, variability and information content of daylight is significantly different to that of electric light, which will cause differences in the levels of visual comfort in the two lighting conditions.

Glare

DAYLIGHT DESIGN STEP 1: establish the lighting need.

An IEA research Task on Optimization of Solar Energy Use in Large Buildings established that the most important first step in designing a successful low energy solar building is to establish what metrics might be used to eastablish success. For example, with lighting quality, the client, the energy analyst and the lighting analyst and the architect (who may be one and the same person!) must establish how they are to measure success in the context of the work or activity in the building.

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