Calculate the Distance Between Two Street Lights

George Jul 01, 2026

The distance between two street lights is a common concern for urban planners, city dwellers, and pedestrians alike. It's not just about aesthetics; the spacing between these illuminations can significantly impact safety, energy consumption, and even the ambiance of a street.

an image of street lighting features
an image of street lighting features

Understanding the optimal distance between street lights requires a balance between visibility, energy efficiency, and cost-effectiveness. Let's delve into the factors influencing this spacing and explore the best practices for street lighting.

How To Calculate No Of Street Light Poles
How To Calculate No Of Street Light Poles

Factors Affecting Street Light Spacing

Several factors determine the ideal distance between street lights. These include the type of street, traffic volume, pedestrian activity, and the specific lighting technology used.

Благоустройство Территории ТЦ
Благоустройство Территории ТЦ

For instance, well-lit streets are crucial for high-traffic areas and pedestrian-heavy zones to ensure safety. Conversely, residential streets with lower activity may require less frequent lighting.

Street Light Types

How To Calculate No Of Street Light Poles
How To Calculate No Of Street Light Poles

Different street light types have varying throw patterns and lumen outputs, affecting their optimal spacing.

For example, cobrahead lights typically have a wide, even light distribution, making them suitable for long, straight roads. Conversely, pole-mounted lights with cut-off features are ideal for reducing glare in residential areas.

Lighting Standards and Regulations

an empty street at night with no one on the sidewalk or in the street lights
an empty street at night with no one on the sidewalk or in the street lights

Many cities follow Illuminating Engineering Society (IES) standards or local regulations for street lighting. These guidelines consider factors like roadway type, vehicle speed, and pedestrian activity to recommend appropriate light levels and spacing.

For instance, IES recommends a minimum average roadway illuminance of 1.0 footcandle (11 lux) for residential streets and up to 3.0 footcandles (33 lux) for high-speed, high-traffic roads.

Calculating Street Light Spacing

two street lights are lit up in the evening
two street lights are lit up in the evening

To calculate the distance between street lights, consider the following steps:

1. Determine the desired average roadway illuminance based on the street type and activity level.

street lights at night, antique lights, classic lights
street lights at night, antique lights, classic lights
an empty road with two street lights on each side and hills in the distance behind it
an empty road with two street lights on each side and hills in the distance behind it
Full Morning Moon
Full Morning Moon
Nocturnal picture
Nocturnal picture
street lights against a cloudy sky at night
street lights against a cloudy sky at night
a car parked on the side of a road at night with street lights above it
a car parked on the side of a road at night with street lights above it
a park bench sitting under two street lights at night with no one on it or in the distance
a park bench sitting under two street lights at night with no one on it or in the distance
a traffic light sitting on the side of a road next to a one way sign
a traffic light sitting on the side of a road next to a one way sign
a street light sitting on the side of a road next to a tall brick building
a street light sitting on the side of a road next to a tall brick building
two traffic lights are lit up at night on the same street as an empty road
two traffic lights are lit up at night on the same street as an empty road
two different views of street lights in the snow at night and on winter's day
two different views of street lights in the snow at night and on winter's day
foggy night
foggy night
a traffic light and street signs on a pole in front of some trees with no leaves
a traffic light and street signs on a pole in front of some trees with no leaves
Street light ✨️
Street light ✨️
the street lights shine brightly on a foggy night with no one in sight at all
the street lights shine brightly on a foggy night with no one in sight at all
two people reaching their hands up towards a street light at night with the sun in the background
two people reaching their hands up towards a street light at night with the sun in the background
two street lamps are lit against the cloudy sky
two street lamps are lit against the cloudy sky
two street lamps lit up at night with the moon in the background
two street lamps lit up at night with the moon in the background

2. Measure the light output (lumens) and light distribution pattern (throw) of your chosen street light fixture.

3. Use these values in a spacing calculator or consult IES tables to find the appropriate spacing for your specific lighting setup.

Spacing Calculator Example

Let's assume you're using a 150W LED cobrahead light with a 100° x 70° beam pattern, aiming to achieve an average roadway illuminance of 2.0 footcandles (22 lux) on a two-lane road with a 35 mph (56 km/h) speed limit.

Using an online spacing calculator, you might find that the optimal spacing for this scenario is approximately 80 feet (24 meters) between each pole.

Field Verification and Adjustments

After installing street lights, it's essential to verify their performance using a light meter. This helps ensure the desired illuminance levels are met and makes any necessary adjustments to spacing.

Regular maintenance and inspections should also be conducted to maintain optimal lighting performance and safety.

In the end, finding the right distance between street lights is a balance between safety, aesthetics, and energy efficiency. By understanding the factors at play and following best practices, cities can create well-lit, safe, and inviting streets for all.