A street light pole is the load-bearing steel or aluminum column that raises a roadway luminaire to its designed mounting height, sized so it survives the site’s wind for decades . Specifying one well comes down to six decisions: arm configuration, material, height matched to the road class, steel grade and wall thickness, a signed wind-load calculation, and the certifications that prove the structure and the lamp are real. Get those right and the pole is a non-issue for thirty years. Get the wall thickness or the wind calc wrong and you find out during the first storm, after it is concreted into the ground.
We manufacture these columns and ship them into Europe, the Gulf, and other export markets, so most of what follows is shaped by what we have seen fail in the field and what buyers wish they had asked before the purchase order went out.
What a street light pole is and the arm types
A street light pole is a load-bearing column that raises a luminaire to a designed mounting height; the main families by use are street/roadway poles, parking-lot poles, area or landscape poles, and high-mast poles . A roadway pole is built for one job: hold the light over the carriageway at a fixed height and geometry, and stay there under wind, vibration, and corrosion. Everything in the spec exists to serve that.
The arm is what positions the luminaire over the road. Single-arm poles carry one luminaire on one outreach bracket and suit a road lit from one side. Double-arm poles carry two luminaires, usually back-to-back, for a central median or a wide two-way road lit from the middle. The bracket length and rise angle set how far the light reaches over the lane, which is why arm geometry is part of the photometric design, not an afterthought.
Bracket arms come in fixed lengths and rise angles; a 1.5m arm at 10 degrees puts the luminaire in a different position over the lane than a 2.5m arm at 5 degrees. The lighting designer chooses the geometry to hit the target illuminance and uniformity, then the pole is built to match. Specifying an arm without a photometric layout is guessing.
Height by road class
Pole height is set by the road class, because mounting height drives both the light distribution and the wattage you need. Application height runs roughly 3 to 6m for residential streets, 6 to 8m for secondary roads, and 8 to 12m for main roads and highways; parking lots typically sit between 6 and 12m . Height drives the LED wattage selection, so the pole and the lamp are chosen together, not in isolation .
| Road class | Typical pole height | Common arm config | What drives it |
|---|---|---|---|
| Residential / local street | 3 to 6m | Single arm | Pedestrian scale, low speed |
| Secondary / collector road | 6 to 8m | Single arm | Wider carriageway, moderate speed |
| Main road / arterial | 8 to 12m | Single or double arm | Multiple lanes, higher speed |
| Highway / dual carriageway | 8 to 12m, high-mast above | Double arm or high-mast | Wide spans, central median |
| Parking lot | 6 to 12m | Single or double | Area coverage, low pole count |
Taller poles raise the wind moment at the base, so a 12m main-road pole is not a 6m residential pole with extra tube welded on. The base diameter, wall thickness, and foundation all scale with height. A supplier who quotes the same wall thickness across the whole height range has not run the numbers.
Material: steel or aluminum
Steel and aluminum are the two main pole materials, and the choice is a strength-versus-maintenance trade. Steel offers higher strength and lower cost for tall and heavily loaded poles; aluminum resists corrosion with less maintenance and suits lighter applications . For roadway poles at 8m and above carrying real luminaire weight and wind area, steel is the default because it carries the load at a lower material cost .
Aluminum earns its place on shorter decorative or coastal poles where the corrosion resistance offsets the higher price and lower strength. Where it gets oversold is on tall arterial poles, where you end up paying more for a thicker section to match steel’s stiffness. The honest answer is application-driven, not a blanket “aluminum is better.”
The catch with steel is corrosion, and that is a finish problem, not a steel problem. A correctly galvanized and coated steel pole outlasts the lamp on top of it. We treat the finish as a separate specification with its own standard, covered in the sibling guides linked at the end.
Structural spec that decides whether the pole stands
The two numbers that decide whether a pole stays up are the steel grade and the wall thickness, and they are the two most often left vague on a quote. Our roadway shafts are rolled from S355 structural steel, a grade that yields higher than the everyday S235, and the 3mm or 4mm wall is set by calculation for that pole rather than carried over from habit . S355 versus S235 matters because a higher yield lets the same section carry more load, or lets a thinner wall do the same job at lower weight.
Wall thickness is where cheap poles cut corners, because steel is sold by weight and a half-millimeter shaved off the wall is invisible on a drawing but real on the wind moment. A pole that looks identical from outside can have 30 percent less section than one specified properly. This is why “verified by calculation” is the phrase that matters: the wall thickness should fall out of a structural calc for that height and that wind zone, not a catalog default.
Ask for the steel grade in writing (S355, not “high-strength steel”) and the wall thickness at the base, and ask whether those came from a calculation. A supplier who can produce the calc has done the engineering. One who quotes a thickness with no calc behind it is selling you a tube and hoping.
Wind load: the calculation buyers forget to ask for
Wind load is the single most skipped item in pole procurement, and it is the one that fails catastrophically. A street light pole is a cantilever in the wind, and the load depends on the luminaire’s projected area, the arm, the height, and the local wind speed. The right deliverable is a signed static wind-load calculation done to the destination country’s code, not a generic EPA rating off a catalog page.
We provide signed static wind-load calculation reports per destination-country code, for example PN-EN 1991-1-4 for Poland, rather than catalog-only EPA ratings . EPA (Effective Projected Area) is a useful screening number from the Illuminating Engineering Society framework, but a catalog EPA figure is not a structural calc for your specific pole in your specific wind zone. The local code sets the design wind speed, and a Gulf coastal site and an inland European town are not the same load case.
The practical rule: if the pole is going into a regulated market, the wind-load calc to the local Eurocode or national annex is part of the deliverable, often required for the permit. Buy from someone who issues it signed. A pole sold without one shifts the structural liability onto you.
Certifications a roadway pole should carry
Certifications are the difference between a claimed spec and a verified one. The structural side is governed by EN 40, the European standard for lighting columns, and EN 1090, the standard for the execution of structural steelwork. Our roadway columns are attested to both EN 40 and EN 1090 and carry CE marking for sale into the EU . EN 40 covers the column’s design, materials, and verification; EN 1090 governs how the steel is fabricated and welded, which is where field failures originate.
The luminaire on top carries its own certifications, and you want both halves verified. Tested to IES LM-79, our LED fixtures return 119.37 lm/W of luminous efficacy (Cert LCSB08185046S), and their enclosures are verified to IP66 for ingress (LCSB08185044S) and IK10 for impact (LCSB08185045S) . The IP Code IP66 rating means dust-tight and protected against powerful water jets, which is the minimum any roadway luminaire should hold; IK10 is the top impact class, for vandalism and debris.
When you collect these on a single order, you can match the structural certification (EN 40 / EN 1090) to the photometric and ingress data (LM-79, IP66, IK10) and confirm the whole assembly is documented. A supplier who can hand over both sets of certificates has nothing to hide. One who has the lamp certs but waves off the structural side has a gap exactly where poles fail.
Questions to ask a supplier
The fastest way to separate a real pole manufacturer from a trader is the question list, because the trader cannot answer the structural ones. Buying the pole and the luminaire from one manufacturer ensures pole-lamp compatibility, the bolt circle, the arm fit, and the load rating, and it reduces installation problems compared with sourcing the two separately . Split sourcing is where the bolt circle does not match the base plate on site.
Ask these, in writing, before the deposit:
- What steel grade and base wall thickness, and is there a calculation behind them?
- Can you issue a signed wind-load calc to my country’s code for this exact pole?
- What EN 40 / EN 1090 documentation covers the structure, and what IP and impact rating on the luminaire?
- Does the pole base, anchor bolts, and the arm match the luminaire I am specifying?
A manufacturer answers all four with documents. A trader answers the first with a guess and the rest with silence. The questions cost nothing and they tell you exactly who you are dealing with before the pole is in a container.
Frequently asked questions
What is the difference between a single-arm and double-arm street light pole?
A single-arm pole carries one luminaire on one outreach bracket for a road lit from one side, while a double-arm pole carries two luminaires for a central median or a wide two-way road lit from the middle. The arm length and rise angle position the light over the lane and are set by the photometric design.
What height should a street light pole be?
Pole height is set by road class: roughly 3 to 6m for residential streets, 6 to 8m for secondary roads, and 8 to 12m for main roads and highways, with parking lots between 6 and 12m. The mounting height also drives the LED wattage, so the pole and lamp are specified together.
Should a street light pole be steel or aluminum?
Steel is the default for tall, loaded roadway poles because it gives higher strength at lower cost, while aluminum suits shorter or coastal poles where its corrosion resistance and lower maintenance offset the higher price. For most arterial and highway poles at 8m and above, steel carries the load more economically.
What steel grade is used for street light poles?
S355 structural steel is the grade for engineered roadway poles, offering higher yield strength than the common S235, paired with a base wall thickness of 3mm or 4mm verified by structural calculation. Ask for the grade and wall thickness in writing, and confirm a calculation supports them rather than a catalog default.
What certifications should a street light pole have?
The structure should be built to EN 40 (lighting columns) and EN 1090 (structural steel execution) with CE attestation for the EU market, and the luminaire should hold IES LM-79 photometric data, IP66 ingress protection, and IK10 impact resistance. Collecting both the structural and luminaire certificates confirms the whole assembly is documented.
What is a wind-load calculation and why does it matter for street light poles?
A wind-load calculation is a signed structural analysis of the pole as a cantilever, accounting for luminaire area, arm, height, and the destination country’s design wind speed. It matters because a catalog EPA rating is not a calc for your specific pole and wind zone, and a regulated market often requires the signed calc to the local code for the permit.
Can I buy the pole and luminaire from different suppliers?
You can, but buying both from one manufacturer ensures the bolt circle, arm fit, and load rating match, which reduces installation problems on site. Split sourcing is the common cause of a base plate whose bolt circle does not match the foundation bolts when the crew arrives.
