EDITORIAL

SECRETARY Brendan Keely FSLL bkeely@cibse.org

SLL COORDINATOR Juliet Rennie Tel: 020 8772 3685 jrennie@cibse.org

EDITOR Jill Entwistle jillentwistle@yahoo.com

COMMUNICATIONS COMMITTEE: Linda Salamoun MSLL (chair) James Buck Iain Carlile FSLL Jill Entwistle Chris Fordham MSLL Rebecca Hodge Eliot Horsman MSLL Stewart Langdown FSLL Luke Locke-Wheaton Rory Marples MSLL

All contributions are the responsibility of the author, and do not necessarily reflect the views of the society. All contributions are personal, except where attributed to an organisation represented by the author.

COPY DATE FOR LL4 2021 IS 10 MAY

PUBLISHED BY The Society of Light and Lighting 222 Balham High Road London SW12 9BS www.sll.org.uk ISSN 2632-2838

© 2021 THE SOCIETY OF LIGHT AND LIGHTING

The Society of Light and Lighting is part of the Chartered Institution of Building Services Engineers, 222 Balham High Road, London SW12 9BS. Charity registration no 278104

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FROM THE EDITOR

The whole point of the SLL's series of lighting guides is that they deal with the specific issues which arise in any one sector or environment. But whether that is scene setting for liturgical events in a religious building, lighting for patient comfort and practical medicine in a hospital, or conservation concerns in a museum, at heart the guide is about lighting for human needs.

It is a consideration that Mark Sutton Vane underlines in his summary of the forthcoming update of LG8 – Lighting for Museums and Art Galleries (Art of illumination, p5), a revision largely driven by rapid developments in lighting equipment. 'While technology has evolved, humans and their eyes and their feelings have not changed,' says Sutton Vane. 'Light has not changed.' As a result, the guide emphasises the subjective and human responses to light and how those responses can be influenced by the lighting designer.

That aspect of lighting has become a whole lot more complicated now that we know we are dealing with both visual and non-visual responses. While one arm of academia is still wrestling with how to quantify meaningfully the light we can see, other research has moved into more tenebrous areas, the metrics of non-visual light. Also in this issue, the 2020 Jean Heap Bursary recipient, Manuel Spitschan, outlines his research subject, luox, a new platform for quantifying the non-visual effects of light (A measure of the unseen, p8).

Whatever the metric, as Sutton Vane says, the equation must ultimately add up to human wellbeing.

JILL ENTWISTLE

JILLENTWISTLE @YAHOO.COM

CURRENT SLL LIGHTING GUIDES

SLL Lighting Guide 0: Introduction to Light and Lighting (2017) SLL Lighting Guide 1: The Industrial Environment (2018) SLL Lighting Guide 2: Lighting for Healthcare Premises (2019) SLL Lighting Guide 4: Sports (2006) SLL Lighting Guide 5: Lighting for Education (2011) SLL Lighting Guide 6: The Exterior Environment (2016) SLL Lighting Guide 7: Office Lighting (2015) SLL Lighting Guide 8: Lighting for Museums and Galleries (2015) SLL Lighting Guide 9: Lighting for Communal Residential Buildings (2013) SLL Lighting Guide 10: Daylighting – a guide for designers (2014) SLL Lighting Guide 11: Surface Reflectance and Colour (2001) SLL Lighting Guide 12: Emergency Lighting Design Guide (2015) SLL Lighting Guide 13: Places of Worship (2018) SLL Lighting Guide 14: Control of Electric Lighting (2016) SLL Lighting Guide 15: Transport Buildings (2017) SLL Lighting Guide 16: Lighting for Stairs (2017) SLL Lighting Guide 17: Lighting for Retail Premises (2018) SLL Lighting Guide 18: Lighting for Licensed Premises (2018) SLL Lighting Guide 19: Lighting for Extreme Conditions (2019) SLL Lighting Guide 20: Lighting and Facilities Management (2020) Guide to Limiting Obtrusive Light (2012) Code for Lighting (2012) Commissioning Code L (2018) SLL Lighting Handbook (2018)