Research Information System
Lux Europe 2022 14th European Lighting Conference , Praha, Czech Republic, 20 - 22 September 2022, vol.1, pp.234-237
To increase energy savings, adaptive road
lighting (ARL) systems that can provide dynamic lighting by the change in the
parameters on the road are recommended by international standards. According to
CEN/TR 13201-1 “Road lighting - Part 1: Guidelines on selection of lighting
classes”, adaptive road lighting is defined as “temporal controlled changes in
luminance or illuminance in relation to traffic volume, time, weather or other
parameters”. With the changes in the parameters considered, the initial design
average luminance can be changed by reducing it, usually. The most important
parameters in this respect are, traffic volume (vehicle density), traffic
speed, traffic composition (motorized, pedestrian, etc.), real-time reflection
properties, and the current state of the road surface. Also, the variable effect of ambient
luminosity can be considered. While applying adaptive lighting, it is also
important that changes in the average lighting level do not affect other
required quality parameters on the road.
When the roads with different luminaire
arrangements are taken into consideration, especially roads with a median
separating two directions and the poles with twin bracket arrangement are hard
to design for adaptive road lighting scenarios. If both directions are to be
adjusted to different levels of lighting classes, the designer should make
detailed calculations since depending on the luminous intensity distribution of
the luminaire, the contribution of one luminaire to the other side should be
analyzed. Especially as the median width gets shorter, the contribution of the
luminaire will increase. And if a one-sided dimming scheme is used, the
contribution to the other side will decrease proportionally to the dim level.
Thus, different luminous intensity distribution types (in 270° plane) should be
analyzed for different scenarios, and energy efficiency calculations should be
done using these different scenarios.
In this paper different luminous intensity
distributions (in 270° plane) will be evaluated against different median widths
for a sample M2 lighting class road illuminated with the twin bracket
arrangement on the median. For both directions, different couples of lighting
classes will be simulated using Dialux lighting simulation software ie. M2-M2
(base), M2-M4 (static), and also M2-10% (dynamic) level for no traffic “night”
scenario for one side. Using the M2-M2 scenario as a base, how much the
luminaires' luminous output should be increased or dimmed will be calculated
and energy saving calculations for different scenarios will be done against the
standard operation scenario which is M2-M2 lighting classes for both sides. As
a result, depending on the 270° plane distribution of the luminaire power to be
selected during the design, it will be determined how much more should be
selected according to the base scenario.
Keywords—Adaptive Road Lighting, Luminous
Intensity Distribution, Lighting Simulation