2011 - Daylight Symposium
EUROPEAN DAYLIGHT STANDARD by Peter Raynham
Speakers
Peter Raynham
Lighting Education Trust Lecturer
Bartlett
There is currently under development a European standard on daylight. The standard when complete will form part of set of European Standards in the area of lighting application created by CEN and it will be closely related to EN 12464-1 – Light and Lighting, Lighting of Work Places, Indoor Work Places and EN 15193 – Energy Performance of Buildings, Energy Requirements for Lighting. The current working group developing the standard is made up of 22 experts representing 10 different national standards bodies.
Work on the standard has only just started but the group has already planned out the shape of the document. It will cover all building types including dwellings and workplaces and will include a special section for people with limited mobility that may not be able to get out. The main topics that will be addressed are view out, daylight available to a building on a given site, the daylight performance of the building and the health impact of daylight.
Whilst probably the best way to control daylight in buildings is climate based modelling; there is not sufficient experience of using such techniques to enable the writing of standard and so the basis of the recommendations will be the use of daylight factor. However, as daylight availability varies so much across Europe the daylight factor metric will have to be adjusted so suit different climates. The standard will give guidance on how to size windows to meet a given daylight factor to allow compatibility with a number of existing national daylight standards which control window size.
It is recognised that this standard will not of itself improve the use of daylight as most good buildings will already have better daylight than that it recommends, the function of the document will be to stop the buildings with poor daylight being built.
Peter Raynham is the Lighting Education Trust Lecturer. He has been working in the area of Light and Lighting since 1976 and has been at the Bartlett since 1996. His research interests cove the whole scope of lighting ranging from street lighting to lighting in schools, the use of daylight and lighting calculations. He is currently running an EPSRC funded project looking at glare associated with street lighting and has recently won another bid to look at Mesopic lighting for pedestrians (MERLIN). Peter is active in a number of professional and standards bodies and is the president elect of the Society of Light
and Lighting.
