Lunch & Learn: The Nordstrom Tower: A landmark evaluation of daylight injury webinar

3 March, 2017 | 13:00 - 14:00

Computer rendering of the Nordstrom Tower showing the cantilever which will project over the historic Art Students League Building.
Computer rendering of the Nordstrom Tower showing the cantilever which will project over the historic Art Students League Building.

About this event

Any new building will have a detrimental effect on the daylight provision to the surrounding buildings to a greater or lesser degree depending on the particulars of the proposed design and the existing context. The detrimental effect, or 'injury', can be determined by a variety of means depending on the mode of assessment.

All of the existing measures for daylight injury are simplifications and/or idealisations of actually occurring conditions. The daylight illumination experienced by people in real spaces is the combined effect of skylight and (when present) sunlight, including the contribution of reflections from both outside and inside of the space. Because of the natural variability of daylight, any measure of injury should be based on a long-term evaluation rather than at just one or perhaps a few instants. Given the seasonal variability of daylight, the shortest truly representative period for evaluation should be a full year.

This webinar describes a landmark, and possibly still unique, evaluation of daylight injury which is founded on climate-based daylight modelling (CBDM). The evaluation was set in New York (USA), and the proposed building - now known as the Nordstrom Tower - will be the tallest residential tower in the world when completed in 2018.

The theoretical basis for the evaluation technique - now known as climate-based daylight modelling - was developed by the presenter (Mardaljevic) in the late 1990s and rigorously validated using the BRE-IDMP dataset. CBDM now forms the basis for research, and increasingly, industry practice worldwide. CBDM has been applied to solve a wide range of traditional and novel daylighting design problems.


Professor John Mardaljevic, BSc MPhil PhD FSLL, Professor of Building Daylight Modelling, Loughborough University.

Event materials

The following materials are available for download:


John Mardaljevic

John Mardaljevic

John Mardaljevic (PhD, FSLL) is Professor of Building Daylight Modelling at the School of Civil & Building Engineering, Loughborough University. Mardaljevic pioneered what is now known as Climate-Based Daylight Modelling (CBDM).

Founded on rigorous validation work, CBDM is now the basis for research and, increasingly, industry practice worldwide. Mardaljevic's practice-based research and consultancy includes major projects such as the New York Times Building and The Hermitage (St. Petersburg). He currently serves as the 'UK Principal Expert on Daylight' for the European Committee for Standardisation CEN / TC 169 WG11, and on a number of International Commission on Illumination (CIE) technical committees.

In 2012 Mardaljevic was presented the annual UK lighting award by the Society for Light and Lighting (SLL). He is Associate Director for Daylighting CIE Division 3 and CIE-UK Representative also for Division 3.