1Luminaire & Installation
ft
°
Beam angle along the road direction (wide-beam 110–140°)
°
°
Arm tilt, typically 5–15°
lm
2Road Geometry & Efficiency
ft
ft
Affects the road width covered per lamp
%
%
3Calculation Results
Road Arrangement Reference
| Road Type | Lamp Height | Spacing | S/h |
|---|---|---|---|
| Arterial Road | 33–39 ft | 98–131 ft | ≤3.5 |
| Secondary Road | 26–33 ft | 82–115 ft | ≤3.5 |
| Branch Road | 20–26 ft | 66–98 ft | ≤4 |
| Courtyard / Sidewalk | 13–20 ft | 49–66 ft | ≤4 |