LED glare, dazzle and visual discomfort when approaching from either direction
Reported via desktop in the Street Light category anonymously at 11:48, Thursday 17 March 2022
Sent to Bristol City Council less than a minute later
This bad quality ice-white LED street light is causing glare, dazzle and visual discomfort, partially blinding the observer and destroying dark-adaption, obscuring darker details of the scene and adding hazard by preventing the view needed to navigate the way ahead. This is due to: - too much luminous intensity concentrated into too small an exposed area of emitter; - lack of diffuser; - throwing shadows that are intensely dark and sharp-edged and cannot be interpreted, adding hazard to the night time environment; - too high intensity of blue and violet short wavelength light that is difficult for the dark-adapted human optical system to process;
Furthermore: - Bad quality blue-rich LED lighting has a harsh cold and icy quality that makes the illuminated night-time environment feel uncomfortable and unsafe. - At night, the blue-rich light of bad quality LED street lighting has a detrimental effect on the circadian cycles of humans and wildlife. Birds singing at 2.30am? - Nocturnal lighting should be balanced towards red-orange scoptopic (night) vision instead of blue-green photopic (day) vision, unless the objective is to turn night into day. - Lumens per watt in isolation are a poor measure of night-time light quality. Colour temperature, continuity of spectrum, CRI, and diffusion are also important visual technical parameters. - Diffusers should be provided to limit the luminous intensity to comfortable non-glaring levels. This was standard on older high-pressure sodium and ceramic metal halide luminaires, but seems to be completely missing from the bad quality LED luminaires that are appearing all over Bristol.
Neglect of duty: Street lighting should illuminate the way safely, securely and efficiently, but must also be sensitive to the needs of residents and the local environment in providing amenity and ambiance. Bristol City Council is failing in its duty to include the above non-functional requirements when meeting its obligation to provide street lighting. Please remove bad quality LED luminaires and replace with luminaires giving the same or less glare as the original luminaires having diffusers, and without excessive blue/violet content.
A new enquiry has been raised for this issue.
Posted by Bristol City Council at 11:48, Thursday 17 March 2022
A citizen has provided a follow-up to the original enquiry.
Posted by Bristol City Council at 11:49, Thursday 17 March 2022
This issue has been reallocated to the relevant officer or team for action. They'll update you on progress.
Posted by Bristol City Council at 13:43, Thursday 17 March 2022
This issue is currently under investigation. We'll provide updates on the outcome as soon as we can.
Posted by Bristol City Council at 12:58, Sunday 20 March 2022
A job has been raised with our contractors to action this issue and appropriate repairs or maintenance will be undertaken as soon as they can.
Posted by Bristol City Council at 14:13, Monday 21 March 2022
This enquiry is now closed. No further action is required.
State changed to: Fixed
Posted by Bristol City Council at 10:57, Tuesday 22 March 2022
This report is now closed to updates. You can make a new report in the same location. Please reference 3395506 in your new report if it is an update on this one.