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) Iain Carlile FSLL Jill Entwistle Chris Fordham MSLL Rebecca Hodge Eliot Horsman MSLL Stewart Langdown FSLL Rory Marples MSLL Bruce Weil Gethyn Williams

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 LL1 2021 IS 9 NOVEMBER

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

© 2020 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

Reflecting a general preoccupation in lighting at the moment, this issue is permeated with the theme of health and wellbeing. It is, of course, the focus of the Lighting Research and Technology Symposium which the SLL is hosting online this month.

That there is a relationship between lighting and health – whether physiological or psychological, visual or nonvisual, natural or electric – is beyond dispute. After that it becomes rather more complicated.

As has been discussed before in these pages, in Rumsfeld terms we are dealing with both known unknowns and unknown unknowns but this has not stopped categorical statements being made and specific 'circadian' solutions being marketed.

This state of affairs has caused anxiety among lighting designers and manufacturers, says the SLL, because both groups are concerned that 'the claimed benefits may not be evident in practice, or worse, they may be detrimental to human health'.

Both Peter Raynham and John Mardaljevic, symposium speakers examining how electric and natural light solutions for health can be implemented (see p5), point out the difficulty of establishing a starting point. 'To provide the electric lighting necessary to support human health we must first understand which bits of health we can support and what sort of level of proof we need to make a health claim,' says Raynham.

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) Guide to Limiting Obtrusive Light (2012)

Code for Lighting (2012) Commissioning Code L (2018) SLL Lighting Handbook (2018)