The city of Milan has recently upgraded the street lighting infrastructure of some of its areas needing safety like walkways and underpasses installing Disano LED spotlights (Astro and Cripto).
Crosswalks and underpasses illuminated with brand new spotlights. The city of Milan has recently upgraded the street lighting infrastructure for some of the city’s hot spots in terms of safety and security using Disano LED spotlights (Astro and Cripto).
Public lighting is closely connected with safety. In the case of public lighting, safety has a dual purpose: on the one hand, it is called to protect pedestrians and vehicles, on the other, it must convey the feeling of safety during the evenings and at nights. In both cases, the quantity and quality of lighting has a key role.
Thanks to the new LED lighting system, local administrations can now increase the safety of their citizens, while improving energy management with the energy savings guaranteed by the new lighting sources.
As for street lighting, the rules and regulations for designing a good lighting system have significantly increased pedestrian safety. An example of this is the introduction of the “Surround Ratio” (SR) parameter that considers road lighting as an important way to allow drivers to perceive in advance the presence of a person who could eventually cross the street. There are many parameters to consider.
According to a recent report* of the Department of Engineering at the “La Sapienza” University of Rome, a safe street lighting system must take into account the following key parameters:
- Visual acuity or minimum visual angle in which the human eye can distinguish the presence of an object;
- Sensibility to contrast is the ability of the eye to perceive the brightness difference in two adjacent areas;
- The visual field is the portion of space that can be captured by the human eye;
- Colour perception is the ability of the human eye to perceive and distinguish colours;
- The visibility factor is a measure of the sensibility of the eye;
- The level of access to a pedestrian area is the possibility to distinguish all the obstacles on the walking surface;
- The amount of light at floor level;
- The contrast of luminance is the level of luminance of an object with respect to the background.
Basically, the amount of lighting is only one of the factors required to determine an effective and efficient street lighting infrastructure. Moreover, good lighting should consider other factors (colour rendering, glare, etc.) that are essential for proper viewing.
It is with these requirements in mind that Disano designed its latest generation products such as Astro and Cripto that offer up to 70% of energy savings at an extraordinary lighting quality. The new LEDs, in fact, have a very high colour rendering that makes it easier for people to distinguish objects and faces and are specifically designed to avoid any form of glare.
* Illuminazione urbana e scenari di progettazione. [Urban lighting and design scenarios] by Franco Gugliermetti, Fabio Bisegna, Laura Monti. (University of Rome “La Sapienza” DIAEE Department)
- Posted by Redazione
- On May 19, 2016
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