cpd paper light for health and wellbeing
TRANSCRIPT
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Alan Grant, Design and Development Director, DW Windsor
Light for health and wellbeing
CPD PAPER
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The day-night cycle
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Artificial light
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White LED light sources
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Where ignorance is bliss (tis folly to be wise)Thomas Gray 1716-1771
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Donald Rumsfeld, US Secretary of Defence 2001-2006
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How do LEDs affect health?
What we’ve learnt in the past two decades:
• A newly discovered photoreceptor detects optical radiation but doesn’t contribute to image forming
• Photoreception leads to vision & to effects on human physiology, mood and behaviour
• Non-visual photoreception; connection to circadian regulation, melatonin
• Non-visual effects depend on the spectrum, intensity, duration, timing and temporal pattern of the light exposure
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What does this mean for humans?Professor Russell Foster, Professor of Circadian Neuroscience and Head of the Department of
Ophthalmology at Oxford University
• Poor circadian regulation causes loss of attention, memory impairment, failure to process information, and reduced cognition and creativity.
• Compromised biological functions and melatonin suppression lead to immune system suppression, increased likelihood of cancer and cardio-vascular disease, diabetes, metabolic suppression and obesity.
• Mood instability, anxiety and increased risk of mental illness have also been linked.
• Non-visual effects depend on the spectrum, intensity, duration, timing and temporal pattern of the light exposure
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What do lighting organisations say?
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• Clarifies the definition of what is referred to as Blue Light Hazard
• Recognises light sources emitting primarily blue light are a cause for concern for exposure to children’s eyes
• Recognise public concern over non-visual influences of blue light on human health
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• Presents current understanding from leading lighting research scientists
• Urges the industry to recognise the current limitations in our knowledge
• Recognises the need for additional studies
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What’s in a name?
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Human Centric LightingLighting that can benefit the biological, emotional, health, or wellbeing of people. Lighting Europe
Circadian Lighting
Bio-dynamic LightingLight that has a physiological effect on the body.
Nutritional LightThe importance of nutritional light on the wellbeing of people. Good light Group
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Outdoors
The colour temperature question…
• Have we settled on 4000K by accident?
• With efficacies across all colour temperatures improving, should this change?
• Are there applications where different colour temperatures are appropriate in different circumstances at different times?
• How do our lighting strategies affect flora and fauna?
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Spectral Power of white LEDs
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Daylight LEDs
Using violet LEDs and phosphor chemistry, blue content is reduced.
Effect of daylight LED on visual comfort, melatonin, mood, waking performance and sleep
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Daylight LEDs
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Moonlight LEDs
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Trade-offs
Efficacy reduces as:
• Colour temperature gets warmer
• CRI improves
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Dynamic lighting
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International Lighting Policy
• Outdoor lighting curfews• Colour temperature
restrictions: 3000K max, 2700K & 2400K
Italy• No light above horizontal
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The first world atlas of the artificial night sky brightness P. Cinzano, F. Falchi, C.D. Elvidge
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7.5 million streetlights in the UKFrédéric Tapissier
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Summary
• Warmer colour temperatures
• Dynamic lighting & control
• Shields as standard in residential areas?
With good lighting, everybody wins