1. Background: Why Secondary Roads Often Face Uneven Lighting

Secondary roads sit between main roads and local streets, often featuring variable widths and mixed traffic conditions. These characteristics make lighting uniformity more challenging. Common issues include uneven illumination, dark edges, and localized glare.

2. Core Issue: Mismatch Between Optical Distribution and Road Layout

1) A single light distribution is difficult to adapt to diverse road conditions.

Traditional lamps usually adopt a single photometric design, which often leads to insufficient or overly concentrated light coverage when dealing with roads of different widths or curves.

2) Installation Constraints Affect Light Positioning

When the installation height of the lighting fixtures is within the range of 6 to 10 meters but the appropriate light distribution is not matched, it will result in the deviation of the illuminated area or uneven overlapping.

3. Selection Guidelines for Secondary Roads

In the secondary road lighting project, the following key elements are recommended to be given priority attention:
Select appropriate light distribution based on the road width (prefer Type II/III)
Match the installation height (6–10 meters) with the power configuration
Prioritize the use of lamps with angle adjustment capability (±15°)
Confirm that the electrical parameters (AC 90–305V) are suitable for the local power grid conditions
Ensure that the protection level reaches IP66 to adapt to the outdoor environment

In the lighting of secondary arterial roads in cities, by adopting multi-lighting design combined with proper installation and stable electrical parameters, the problem of lighting uniformity can be effectively improved. Compared with the single lighting design, this method is more suitable for complex road structures and provides a more reliable technical path for municipal lighting.