Decorative street light pole height and spacing
Height and spacing decide how many poles you buy. Get them wrong and you either pay for poles you did not need or end up with dark patches between lights.
Typical height bands
| Application | Mounting height | Spacing (first estimate) | Commonly targeted average lux* |
|---|---|---|---|
| Garden and park paths | 3 to 5 m | 10 to 18 m | 5 to 10 |
| Residential and township streets | 4 to 6 m | 14 to 24 m | 5 to 10 |
| Riverfront promenade | 4 to 8 m | 14 to 28 m | 10 to 15 |
| Commercial street | 6 to 9 m | 20 to 32 m | 15 to 20 |
| Boulevard or median (double arm) | 8 to 12 m | 28 to 40 m | 15 to 30 |
*Lux values are commonly seen in Indian tenders and design briefs. Your tender, IS 1944 or the local authority's table takes priority.
Why 3 to 4 times height?
A luminaire throws light in a pattern, and the pattern widens as the lamp goes higher. Past roughly four times the height, the dark gap between two poles starts to drop below an acceptable ratio to the bright spot under each pole. Closer than three times, you are paying for overlap you do not need. Decorative luminaires with a wide, soft distribution often want the lower end of the range, and optics designed for roads can stretch toward the upper end.
Four layouts and when to use them
- Single side. One row of poles along one edge. Fine for roads up to about 6 m wide and for paths.
- Staggered. Poles alternate sides. Gives even light on 6 to 8 m roads and looks balanced. Spacing per side is double the along-road spacing.
- Opposite. Poles face each other. Useful on wide roads and where both pavements are busy.
- Central double arm. One pole on the median lights both carriageways. Efficient, but check the wind load of two arms.
Worked example 1: park perimeter path
The path is 400 m long and the design uses 4 m poles. At 3 to 4 times height, spacing is 12 to 16 m. That gives 25 poles at 16 m and 34 at 12 m. If the park has trees with dense canopy, plan for the closer spacing, since leaves block a surprising amount of light.
Worked example 2: township road
A 7 m wide road, 600 m long, with 6 m poles in a staggered layout. Along-road spacing of 3.5 times height is about 21 m. Over 600 m that is about 29 intervals, so around 30 poles. Per side that is about 15, each 42 m from the next one on the same side.
Things that quietly change the answer
- Trees, awnings and balconies that shade the light.
- Bends and junctions, which need extra poles even if the straight spacing is fine.
- Pedestrian crossings and bus stops, which usually need higher lux.
- Maintenance factor: LED output falls over time, so designers add a margin.
Use the pole spacing calculator for a fast estimate, then ask for a DIALux or Relux report for the final design.
Questions people ask
What is the standard distance between decorative street lights?
There is no single standard. A common starting point is 3 to 4 times the mounting height, so 12 to 16 m for 4 m poles and 18 to 24 m for 6 m poles.
Does higher wattage let me space poles further apart?
Only up to a point. More watts raise brightness under the pole, but uniformity between poles depends on height and optics. Very wide spacing still leaves dark gaps.
Single arm or double arm for a 7 m road?
A staggered single-arm layout works well. Double arm on a median works better once the carriageways are separate and the road is wider.
Need a quote or a second opinion on your pole spec?
Send the road width, pole height and quantity. A technical person replies, usually the same working day (Mon to Sat, 9 am to 6 pm IST).
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