Councils across the country hope replacing existing bulbs in streetlights with new light-emitting diodes (LEDs) will help save money and reduce emissions.

Authorities in London, Gloucestershire, Lancashire, Cheshire and Dundee, among others, have spent millions of pounds upgrading their lights.

But PHE warned the powerful new bulbs could interfere with people’s natural sleeping patterns, resulting in a feeling similar to “permanent jet lag”.

“Humans have a natural body clock that has an approximate 24-hour cycle. However, light is the main trigger to ensure that we stay entrained,” said John O’Hagan, head of the PHE’s Centre for Radiation, Chemical and Environmental Hazards.

“It is likely that bright light, of almost any wavelength, could have an impact. Disruption of the circadian system can have a major impact on sleep quality and daytime alertness, which in turn impacts wellbeing and safety. It is a bit like having permanent jet lag.”

Since the roll-out of the new lights, residents have complained the new lights are shining into their bedrooms.

Mr O’Hagan warned against installing the new lights “purely on the basis of energy efficiency and cost”, which he said could lead to glare and a rise in light pollution.

“The light spectrum may be enriched in the blue, which may be beneficial for keeping drivers alert, but many people will find the light uncomfortable. High levels of blue light are known to cause damage to the retina in the eye,” he added.

Councils could avoid this by using LED lights which emit warm-coloured light, particularly in densely populated areas, he said.

Local authorities must also consider the effect the different frequency of the new bulbs will have on people, according to PHE. The new lights could make objects appear to jump, rather than move smoothly, PHE warned. 

“Some people seem to be very sensitive to this light modulation, resulting in headaches migraine and less specific feelings of malaise,” the report added.

The Independent

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