How to Specify a Smart Light Pole: 7 Key Parameters (with Road-Class Comparison Table)
Short answer: Specify a smart pole in this order — road class → pole height and spacing → luminaire wattage, then verify material and wall thickness, wind load, IP/IK ratings, mounted modules, power and surge protection, and the communication protocol. Of these, height and spacing determine whether illuminance targets are met, wind load determines safety, and ingress/impact ratings determine service life — these three are non-negotiable.
Values below are common engineering ranges compiled from widely used standards such as CJJ 45 (Standard for lighting design of urban roads) and GB 50009 (Load code for the design of building structures). Always confirm against your local code and the project design institute's calculation.
1. Pole height and spacing by road class
Height and spacing govern illuminance and uniformity, so they come first.
Road class
Typical height
Typical spacing
LED wattage (ref.)
Layout
Arterial / expressway
10–12 m
30–40 m
150–250 W
Both sides, opposite or staggered
Secondary road
8–10 m
25–35 m
90–150 W
Both sides, staggered
Local / access road
6–8 m
20–30 m
50–90 W
Single side
Residential / campus road
4–6 m
15–25 m
30–60 W
Single or staggered
Courtyard / pedestrian path
3.5–4.5 m
12–20 m
20–40 W
Single side
Rule of thumb: keep spacing at roughly 3–4 times pole height. A larger ratio produces visible light/dark banding ("zebra effect"); a smaller ratio raises cost and glare. Intersections and curves need shorter spacing or taller poles.
2. Material and wall thickness
Item
Common practice
Note
Steel grade
Q235 / Q355
Prefer Q355 for tall, heavily loaded or coastal poles
Wall thickness
3–5 mm (increases with height)
12 m poles are typically not below 4 mm
Forming
Tapered one-piece rolled / polygonal folded
One-piece rolling has fewer welds and more even stress
Corrosion protection
Hot-dip galvanising, ≥ 86 μm
Coastal or high-humidity sites: galvanising plus powder coating
Service door
Base opening with anti-theft lock
Keep the opening away from the maximum bending moment section
3. Wind load — the safety item most often missed
A light pole behaves as a cantilever in bending, and wind governs the design. Basic wind pressure is taken from the applicable load code, then combined with terrain roughness, shape factor and wind vibration factor to check top deflection and base moment.
After adding equipment: cameras, screens and antennas greatly increase projected area — the wind load must be recalculated; never reuse the bare-pole calculation
Retrofit projects: inspect wall thickness, corrosion and foundation concrete strength before deciding whether an existing pole can carry new modules
4. IP and IK ratings — two different protections
Rating
Meaning
Street lighting practice
IP65
Dust-tight (6) + water jets (5)
Baseline for outdoor luminaires
IP66
Powerful water jets
Heavy rain, coastal or frequently washed areas
IK08
5 J impact resistance
Common requirement for street lights
IK10
20 J impact resistance
Areas exposed to impact or vandalism
IP protects against water and dust; IK protects against mechanical impact. They are not interchangeable — specify both.
5. Mounted modules — phase them by priority
A pole's value lies in what it can carry, but loading everything at once inflates cost and wind load.
Phase 1 (essential): intelligent lighting control (per-luminaire dimming, circuit control), residual current protection and metering, remote gateway
Phase 3 (as required): information display screens, 5G small cells, emergency call points, EV chargers, traffic-sign integration
More modules is not better. Every added module changes projected area, power demand and structural load. Display screens and 5G equipment have a greater impact and normally need a dedicated structural design.
6. Power supply, earthing and surge protection
Power: meter lighting and equipment circuits separately; allow 20%–30% headroom on the equipment circuit
Earthing: pole earthing resistance is commonly specified ≤ 4 Ω (confirm against project requirements)
Lightning: air terminal at the pole top with a reliable down conductor; SPD on both power and signal lines in the equipment compartment
Compartment: address heat dissipation and condensation; in hot humid climates add moisture protection and drain holes
7. Communication protocol and gateway
Option
Characteristics
Suitable for
NB-IoT
Wide coverage, low power, operator network
Per-luminaire control, metering, small data payloads
LoRa (private gateway)
Self-operated network, no SIM fee, full control
Campus, parks, closed sites
4G / 5G
High bandwidth
Video backhaul, information screens
PLC (power line carrier)
Reuses existing power cabling
Retrofits, sites where new cabling is difficult
Common specification mistakes
Checking the pole but not the foundation: an undersized foundation fails regardless of pole quality
Buying the pole before deciding what it carries: define the module list first, then size the pole and reserve interfaces
Treating IP66 as "a better IK": they protect against different things — list both
Ignoring maintenance: the compartment should allow one-person service, and modules should be replaceable individually rather than requiring a whole-pole swap
Frequently asked questions
How tall is a smart light pole?
Arterial roads are commonly 10–12 m, secondary roads 8–10 m, local roads 6–8 m, and campus or courtyard paths 3.5–6 m. Final height depends on road class, carriageway width and layout, and is confirmed by the designer's illuminance calculation.
What spacing should I use?
Typically 3–4 times pole height: about 30–40 m on arterial roads, 25–35 m on secondary roads and 20–30 m on local roads. Wider spacing causes visible light/dark banding.
Which IP and IK ratings are required?
Outdoor luminaires are commonly specified at IP65 or higher (IP66 for heavy rain or coastal sites) and IK08 or higher (IK10 where impact or vandalism risk exists). Specify IP and IK separately.
Can I add smart modules to an existing pole?
Yes, subject to three checks: remaining wall thickness and corrosion, foundation concrete strength, and a recalculated wind load that includes the new projected area. If any check fails, replace the pole.
Should I install all modules at once?
Generally not. A common sequence is lighting control first, then cameras, environmental sensors and speakers, with screens, 5G and charging added on demand — reserving interfaces and conduit from the start.
What changes for coastal or typhoon areas?
Use a higher basic wind pressure (commonly 0.50–0.90 kN/m²), increase wall thickness or move to Q355 steel, strengthen the foundation and corrosion protection, and re-verify the wind load for every mounted module.