Core Relationship: The Triangular Balance of Pole Height, Lamp Power, and Light Distribution Curve

Ideal road lighting requires uniform light coverage of the target area, avoiding noticeable alternating light and dark bands (zebra crossing effect) and glare. Pole height (H), lamp spacing (S), and lamp light distribution must be optimally matched.

1. How Pole Height Affects Lamp Selection (Primarily Power)

The taller the pole, the higher the luminous intensity and power required to ensure adequate road illumination.

Conclusion: The taller the pole, the greater the lamp power required, requiring a proportional increase in solar panel power and battery capacity, which directly impacts overall configuration and cost.

2. How Pole Height Affects Light Distribution (Light Distribution Curve)

The light distribution curve describes the intensity and distribution of light emitted from a lamp in all directions across a space. Different pole heights require different light distributions to shape the light spot and ensure perfect road coverage.

Low poles (4-6 meters): A "cutoff" or "batwing" light distribution is suitable. Requirements: The light pole is low, and the lamps are close to the eye, requiring strict light control to avoid glare. Light needs to be diffused as much laterally as possible, evenly covering wide but not very long roadways.

Solway Solution: Xinshengyang streetlights typically use lens optics or special reflectors to create a bat-wing light distribution. This light distribution features a wide lateral diffusion angle (110°-140°) and strict vertical control, precisely directing light to the roadway, reducing light pollution toward the sky and spillover to off-road areas.

Effect: The light spot is rectangular or elliptical, perfectly fitting the road's shape and providing highly uniform illumination.

Medium-high poles (over 8 meters): Symmetrical or asymmetric light distribution is suitable.

Requirements: The taller the pole, the wider the illumination range, and the longer the distance the light needs to be projected. Symmetrical light distribution is often used for roads with double-sided lighting; asymmetric (strip-shaped) light distribution is required for roads with single-sided lighting.

Solway Solution: For taller poles, Solway recommends using higher-powered luminaires with more precise optical designs. Asymmetrical lighting distribution is particularly important, as it directs most light toward the far side of the road, while covering the near side. This ensures uniform illumination across the entire road, preventing blinding brightness near and blurry vision far away.