3.2.3.1 Daylighting Guidelines

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In the UK, CIBSE Lighting Guide 10 (2014) recommends the following values:

<2 DF – Underlit, artificial light will be required to supplement

2 – 5 DF Adequate daylight, artificial light may be required some of the time

>5 DF Well lit, artificial light is generally not required but there may be glare and excessive solar gain

LEED (Leadership in Energy and Environmental Design), suggests that daylight factor be a minimum of 2%  in spaces used for critical visual tasks.

BREEAM (Building Research Establishment Environmental Assessment Methodology), suggests that a minimum of 80% of the floor area in occupied spaces has an average daylight factor of 2% or more.

Users are advised to check the guidance applicable to their regions.

                                                                                                                                                                                                                                               

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