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Meeting the standards our eyes don’t take in as much light, in particular, blue
HCL is starting to appear in the lighting standards. For light starts to be filtered out by cells in the eye. Dynamic
example, the European standard EN 12464-1 for office lighting, even though it may not be enough to trigger the
lighting was updated in 2021. As Shelley explains: “The non-visual system, lighting that shifts across the course
standard has increased the light levels that you need to of the day, whether or not it has that circadian system,
help the body clock stay on track during the day. It doesn’t does seem to improve sleep. If you give your body and
specifically mention HCL, but the light levels are now at brain clear signals about what time of day it is, then it
a point where that will be sufficient for circadian helps them do what they needs to do next.”
entrainment and also enough for older people whose
vision is not what it used to be. In building regulations HCL is becoming the new norm for some environments.
such as BREEAM it recommends that lighting should be “There are places where we are starting to see people
installed that mimics the changing light qualities during understand the real value of good lighting. Those people
the day. who do buy into it become absolute converts and
champions of it”
“There are basically two parts to HCL: the visual
dimension, i.e. visual comfort and the ability to change Shelley concludes: “These lighting changes are happening
the colour temperature so that it feels comfortable for quickly but not always in the places they are needed the
people depending on their gender, age and so on. Then most, so the people who need good lighting the most are
we have circadian lighting, which is all about regulating not actually benefitting. However, I believe in the future
the body clock using dynamic lighting. People often use that people will become more enlightened about HCL and
these two terms interchangeably, but they are not quite understand that even small, affordable changes to the
the same thing. With body clock lighting, younger people lighting can help them run more successful businesses.
will predominantly rely on their blue photosensitive cells The role of darkness and proper lighting during the day
in the eye to regulate their body clock. But as we get older will become more of the conversation.”

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