Guan, Longyu; (2020) An Investigation of Alternative Daylight Metrics. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

With the innovation of technology, both our lit environment and the way people perform indoor tasks have changed. Good visual performance became relatively easy to achieve, and as a result the emphasis of lighting design has moved away from the lighting of working planes. Whilst task illuminance is still in use there is now much more emphasis on the appearance of the room and the people in them. In fact, the term “working plane” has been nominally removed in the European electrical lighting standard. Therefore, it is necessary to question the use of working planes in daylight designs. For many years daylight factor has been the dominant metric used to describe the amount of daylight in a room. However, it only considers light falling onto the working plane and thus it may not be the best metric to describe daylight adequacy in modern buildings. A few alternative metrics have been proposed such as the metrics by Climate-based daylight modeling (DA, UDI) which recently have raised a lot interests. In addition, a number of new lighting parameters (MRSE, cubic illuminance and cylindrical illuminance) have also been proposed but only applied to electrical lighting. This research studied a new metric for daylight, derived from MRSE, to find out if the new metric was better at predicting user perceptions of daylight adequacy than the existing working plane based metrics.

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