How Many Street Lights Per Km?

Quick Answer: Street Lights Per Km

Here’s a general guideline based on common projects:

Simple rule: Higher pole = wider spacing = fewer lights per km

What Determines Street Light Spacing?

1️⃣ Pole Height (Most Important Factor)

The taller the pole, the wider the light coverage.

If you are not sure which height to use, read: 6m vs 8m vs 10m Street Light Pole

(This will help you avoid the most common design mistake.)

2️⃣ Road Width

• Narrow roads (4–6m) → closer spacing

• Medium roads (6–10m) → standard spacing

• Wide roads (10m+) → wider spacing

Wider roads require either:

• Higher poles

• Or more lights

3️⃣ Lighting Standard (Lux Requirement)

Different projects require different brightness levels:

• Rural roads → lower lux → fewer lights

• Urban roads → medium lux → standard spacing

• Highways → high lux → more powerful system

4️⃣ Type of Lighting System

For solar street lights, spacing becomes even more critical because:

• Battery capacity is limited

• Power output is not constant

• Poor design leads to dim lighting over time

For a complete understanding of height and system design, check our street light pole height guide

Common Mistakes in Street Light Planning

Mistake 1: Spacing Too Wide

• Creates dark areas

• Reduces safety

• Causes customer complaints

Mistake 2: Spacing Too Close

• Increases cost unnecessarily

• Wastes energy

• Over-designs the project

Mistake 3: Ignoring Pole Height

Many buyers calculate spacing without considering pole height.

This leads to:

• Uneven lighting

• Poor performance

Real Project Example

Rural Road Project (Africa)

• Road width: 6 meters

• Pole height: 8 meters

• Spacing: 30 meters

Result:

• ~33 lights per km

• Balanced cost and performance

• Stable operation after 2+ years

Recommended Spacing by Application

🏡 Residential Roads

• Pole: 6–8m

• Spacing: 20–30m

• Lights per km: 35–50

🏙️ Urban Roads

• Pole: 8–10m

• Spacing: 25–35m

• Lights per km: 28–40

🛣️ Highways

• Pole: 10m+

• Spacing: 30–40m

• Lights per km: 25–33

🔧 Pro Tips for Solar Street Light Projects

If you want long-term performance:

• Match pole height with spacing

• Use high-quality batteries (avoid cheap systems)

• Optimize panel size

• Avoid “fake watt” products

👉 A good design can reduce total cost by 20–30%

✅ Conclusion

So, how many street lights per kilometer?

👉 It depends on your design, but:

• 6m pole → 40–50 lights/km

• 8m pole → 28–40 lights/km

• 10m pole → 25–33 lights/km

👉 Final rule: Correct spacing = better lighting + lower cost + longer lifespan