Page 194 - AJWEP-22-6

Tsankov, et al.

Table 4. Main technical characteristics of light-emitting diode street luminaires used in optimized lighting
calculations

Dimming level steps of the luminaire electric power
Electric power (W) 10.8 16.6 20.5 22.0 25.0 28.5 34.5 41.0 50.0
Luminous flux (lm) 1,401 2,167 2,601 3,061 3,503 3,941 4,681 6,130 7,282
Luminous efficacy (lm/W) 129.7 130.6 126.9 139.1 140.1 138.3 135.7 149.5 145.6

Figure 9. Multi-variant street lighting modeling and optimization in DIALux evo

installation of street-type LED luminaires (Figure 11).
A maximum mounting height of 6.4 m was proposed
when replacing park luminaires with new street LED
luminaires on existing poles fitted with two- or three-
arm brackets. A maximum mounting height of 5 m is
proposed for poles without brackets. The pole extension
details have been designed and specified in the Geometric
Configuration columns of the tables presenting the results
from the simulation calculations (Table 5).
Table 5 presents the achieved lighting performance
indicators for a sample street of class M4 in Pavlikeni.
The project includes detailed lighting calculations
performed by specialized software 25,26 —DIALux evo—
for all class M4 and M5 streets in Pavlikeni, M5-class
streets in Byala Cherkva, as well as for the remaining
Figure 10. Light distribution of a park light-emitting M6- and P6-class streets based on generalized geometric
diode luminaire configurations. The lighting calculations also incorporate
two energy performance indicators introduced in BDS
traffic streets of lighting classes M4, M5, and M6 in EN 13201—D and D . Table 5 is shown as an example,
E
P
Pavlikeni. presenting the results from simulation calculations for
Given that attempts to meet the regulatory all 32 streets and street groups with various geometric
requirements of the current European Union standard for configurations and lighting classes.
traffic roads of lighting classes M4, M5, and M6 using Across multi-scenario optimization of lighting
park-type luminaires result in excessive glare beyond calculations using DIALux evo 27-29 for all streets in
acceptable limits, this study proposed a technical solution the two towns, the optimal luminaire types and rated
involving the extension of the existing park poles and the power levels were determined for each individual street

Volume 22 Issue 6 (2025) 188 doi: 10.36922/AJWEP025310242