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Back to basics

Knowledge economy.


I've been speaking to lots of people outside the lighting sector about the difference lighting can make - particularly to vulnerable people and kids - and why it's worth investing a bit more.


The answer comes back surprisingly often 'well they haven't actually proved any of this, have they?'


So I wanted to share a couple of really balanced and well-referenced papers that set out the arguments and evidence so far that you might find useful when people say that to you.

Does bright light really help you feel more alert? 

Well, according to this paper by Cajochen et al, the 500 lux set as the standard for lighting in a workplace is around 0.5% of the light level on a cloudless day - and current standards just don't set the bar high enough to flip the switch on your body clock.

This paper by Grant, Lockley et al demonstrated how bright blue-enriched light can improve cognitive performance even if you didn't get enough sleep - 

What about colour rendering?

Is full spectrum really worth the extra electricity - when we really just need the 'oomph' of the blue wavelengths to keep us awake during the day? again, according to this small study, again from Cajochen's lab, full spectrum really does make the world of difference to visual comfort, energy and quality of sleep.  

This paper from a team in Singapore suggests that going the extra mile to get to a full spectrum light source might also help to slow the development of myopia too. 

And finally...

Put the kettle on!

I thought you might enjoy this paper about the impact of coloured interiors on our experience of coffee: 'more reddish and lighter coloured coffee shop images were associated with the expectation that the coffee shop would serve a sweeter coffee, while more greenish and darker coloured coffee shop images were associated with more sour/bitter/tastier coffee expectations as well as a higher likelihood of visiting'.