Help Forum

Help requested posted on 14th November 2017:

Hi-vis under LED streetlighting

A local group had comments raised about not being very conspicuous when out firework night when sporting their 'to standard' hi-vis. They are about to go out collecting with their Father Christmas float, and want to be seen. Anyone know if reflective hi-vis does not work as well under LED streetlighting? They think their current kit and LED lighting is the issue. Is there a best type of hi-vis to wear for such conditions?

Liz Mapstone

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Response posted on 15th November 2017 by:
Andrew Fraser

E: andrew.fraser@falkirk.gov.uk
T:

Hi-vis under LED streetlighting

I think the answer may be contained in the simple explanations provided here:

https://brightkidz.co.uk/be-safe-be-seen/how-does-high-vis-work


Response posted on 15th November 2017 by:
Adrian Watling

E: adrianwatling@southend.gov.uk
T:

Hi-vis under LED streetlighting

I have a theory on this but it is purely my own thoughts.

The SOX/S street lights have a wider spread of light compared to LED lighting which is much more directional which gives less light pollution.

If you shine an LED light, torch or modern car head lights (which are mostly LED on newer cars)on to Hi Vis or signs as an example you will see them light up just as well as before.

So in summary, while you may not feel you are as conspicuous, when a light source is directed at your Hi Viz it will show up clearly to the vehicle / person directing the light at you.


Response posted on 17th November 2017 by:
Mark, Caerphilly

E: m.foweraker@cardiff.gov.uk
T:

Hi-vis under LED streetlighting

Not all LED street lighting is the same.
Some Authorities have gone for systems with a very high colour temperature and some systems have a gap spectrum*. Both of these, often in combination, could result in the fluorescent body of the Hi-Viz appearing less bright.
However, as Adrian has said the retro-reflective bands will work just as well as before.
This will mean the Hi-Viz will work just the same for approaching vehicles, but less well for pedestrians.

*my understanding is that there is a misconception that high colour temperature lighting means you get as good a result with lower wattage, so bigger savings. However,with poor colour rendering, and particularly from a gap spectrum, the lights cannot be dimmed as much as can be achieved without detriment compared to a system that gives good colour rendering. YMMV


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