1Calculation Mode
W
lm/W
Typical LED: 130–180 lm/W
2Lighting Area & Efficiency
ft
ft
%
Effective utilization of emitted light 0.4–0.7
%
Dirt accumulation / lumen depreciation 0.7–0.8
3Calculation Results
Road Lighting Illuminance Standard Reference
| Road Class | Average Illuminance | Uniformity |
|---|---|---|
| Expressway / Arterial Road | ≥2.8 fc | ≥0.4 |
| Secondary Road | ≥1.9 fc | ≥0.4 |
| Branch Road | ≥1.4 fc | ≥0.3 |
| Courtyard / Sidewalk | ≥0.9 fc | ≥0.3 |