12m Solar Street Light Pole Spacing Guide: 60W–200W Road Lighting Design

Choosing the spacing for a 12m solar street light is not as simple as choosing a wattage. Road width, pole layout, luminaire optics, mounting geometry, uniformity, glare control and solar-energy sizing all affect the correct design.

Quick answer: for the illustrative wide divided-road layout in this guide, the practical spacing range is 30m to 50m. A 60W LED luminaire is modelled at 30m spacing, 80W at 40m, and 100W–200W at 50m. These are design examples—not universal installation rules. MCL Solar recommends a project-specific lighting calculation before production.

12m Solar Street Light Spacing: Quick Comparison

The key lesson: more wattage does not automatically mean wider pole spacing. In this example, spacing reaches 50m at 100W. Increasing power beyond 100W raises the light level, but does not improve the modelled overall uniformity at the same 50m spacing.

What Road Layout Is This Example Based On?

The data above is an illustrative starting point for a wide divided road—not a generic rule for every project.

If your road is narrower, uses staggered poles, has a different arm length or requires another lighting class, the correct spacing can change substantially. A rural access road, an urban collector road and a highway should never be designed from one generic spacing chart.

60W on a 12m Pole: Why 30m Spacing Can Be Better

In this example, a 60W LED luminaire at 30m spacing provides about 14 lx average illuminance with strong overall uniformity (U0 0.66). It is a useful starting point when a balanced light distribution matters more than maximizing the distance between poles.

80W at 40m: A Balanced Middle Option

The 80W option at 40m spacing maintains approximately 14 lx average illuminance while reducing the pole count compared with the 60W option. However, uniformity is lower, so the choice should be checked against the project’s visual-comfort and safety requirements—not only the initial pole budget.

100W at 50m: The Point Where Spacing Stops Increasing

For this calculation, 100W reaches 50m spacing with about 14 lx average illuminance. It may look tempting to increase the distance further, but overall uniformity is 0.49. Do not approve 50m spacing only because a supplier says “100W is enough.” Ask for the luminaire photometric file, road layout and calculated uniformity values.

120W, 150W and 200W: Choose More Light, Not Automatically More Distance

• 120W: about 16 lx average illuminance at 50m spacing.
• 150W: about 20 lx average illuminance at 50m spacing.
• 200W: about 27 lx average illuminance at 50m spacing.

At the same time, the example threshold increment rises from 11% at 120W to 13% at 200W. Road lighting is a balance of brightness, uniformity and glare control. The best choice is the system that meets the required performance with the lowest practical life-cycle cost—not simply the highest wattage.

A Solar Street Light Needs Two Calculations

A lighting simulation answers: Will the road receive the required light distribution? A solar-system calculation answers: Will the system operate reliably through the required autonomy days at the project location?

1. Road width, lane count, pole layout and target lighting level
2. Luminaire photometric distribution, mounting height, arm length and tilt
3. Local solar irradiation and seasonal conditions
4. Operating hours, dimming profile and required backup days
5. Battery capacity, PV module size, controller settings and temperature
6. Pole wind-load requirements, foundation design and corrosion protection

This avoids a common mistake: selecting a higher LED wattage for brightness without increasing the solar panel and battery for the real daily energy demand. For pole options, see our hot-dip galvanized street light poles.

What Information Should You Send for a Lighting Proposal?

• Project country or city
• Road drawing, road width and number of lanes
• Central median and required pole arrangement
• Target illuminance or lighting standard, if available
• Pole height, quantity and total road length
• Required solar autonomy days and operating schedule
• Tender specification, pole schedule or existing drawing

MCL Solar can recommend the hot-dip galvanized pole, LED luminaire, solar panel, battery and controller configuration and prepare a project-specific lighting calculation.

FAQ

What is the recommended spacing for 12m solar street lights?

There is no universal spacing. In the wide-road example above, 60W uses 30m, 80W uses 40m and 100W–200W use 50m. Your final spacing must be confirmed from road geometry, luminaire optics and required lighting performance.

Can I install 12m solar street lights 50m apart?

Possibly. In this example, 50m is used from 100W upward. Whether it works for your project depends on road width, pole arrangement, light distribution, uniformity and glare limits. Request a calculation rather than relying on wattage alone.

Is 200W always better than 100W for a 12m pole?

No. A 200W luminaire gives higher light levels but increases energy demand and may require a larger PV module and battery. If 100W or 120W already meets the project target, higher power may not be the best value.

What should I request before approving a street-light layout?

Ask for the luminaire IES or LDT photometric file, the calculation report, road geometry and assumptions used. For a solar project, also request a solar-and-battery sizing proposal.

Request a 12m Solar Street Light Layout

Send MCL Solar your road drawing, location, pole height, quantity and target lighting level. Our team will help you select a solar power system and a hot-dip galvanized pole matched to your project.