GAOQIAO Catalog Page
3 Aspect Traffic Light Manufacturer Products
A 3-aspect LED traffic light, displaying red, yellow, and green indications vertically, is the most widely deployed traffic signal configuration worldwide. It governs the dominant pattern of intersection control: stop, prepare to stop, and proceed. From city-centre crossroads to suburban arterials, the 3-aspect signal head remains the standard by which all other configurations are benchmarked. GAOQIAO manufactures 3-aspect LED signal heads in 200 mm, 300 mm, and 400 mm lens sizes, with full EN 12368 photometric compliance and a documented 100,000-hour LED lifespan.
Technical Specifications
| Parameter | Standard Range |
|---|---|
| Lens diameter | 200 mm (8") / 300 mm (12") / 400 mm (16") |
| LED colors | Red (top) + Yellow (middle) + Green (bottom) |
| Housing material | UV-stabilized polycarbonate or aluminum alloy |
| Operating voltage | AC 85–265 V, 50/60 Hz; DC 12/24 V optional |
| Power consumption | 12–18 W (200 mm) to 35–50 W (400 mm) |
| Visibility distance | 300 m to 600 m |
| IP rating | IP65 standard, IP66 optional |
| Working temperature | -40 °C to +70 °C |
| LED lifespan | 100,000 hours |
| Certifications | EN 12368, CE, RoHS, FCC, ISO 9001 |
How to Choose the Right 3-Aspect Signal
Lens size is the primary specification. The 300 mm (12-inch) head is the de-facto global standard for intersection work, suitable for posted speeds up to 80 km/h. The 200 mm (8-inch) head is reserved for low-speed urban streets, parking facilities, and pedestrian-priority zones. The 400 mm (16-inch) head is specified for high-speed arterials, expressway off-ramps, and visibility-critical approaches where sun glare or background clutter is severe.
Three common buying errors to avoid:
- Undersizing for cost savings. An 8-inch head on a 60 km/h arterial creates a real safety risk, because the perceived size of the indication at braking distance is too small. Specifiers should always cross-check the visibility requirement against the road's 85th-percentile speed and approach geometry.
- Mixing photometric standards. A head certified to EN 12368 Class 1 and a head from a non-certified supplier can look identical in datasheets, but perform very differently under direct sunlight. Always request the actual photometric test report for the production batch.
- Forgetting about the controller interface. Modern LED heads use constant-current drivers that are fully compatible with both legacy electromechanical controllers and modern NEMA / ATC controllers, but the dimming signal (where used) must be wired to the correct terminal. GAOQIAO supplies wiring diagrams for both standards.
Key Features and Benefits
EN 12368 Photometric Compliance
Every 3-aspect head is tested to EN 12368 luminous intensity, distribution, and uniformity requirements. The optical system uses a precision lens array, not a simple diffuser, to deliver the correct intensity profile in both daytime and nighttime operation.
Replaceable LED Modules
Each indication is a separate field-replaceable module. Technicians can replace a failed red, yellow, or green module in under 5 minutes using only a screwdriver, without removing the housing from the pole. This modular design dramatically reduces lifecycle maintenance cost compared to integrated-lamp designs.
Optional Features for Project Specifics
Available options include a built-in countdown timer, anti-glare visor, arrow indication module (replacing the green for turn-control applications), backplate with retroreflective border, and a sun-phantom prevention mask for tropical deployments. Each option is specified at order time and tested before shipment.
Common Applications
The 3-aspect LED traffic light is the global default for:
- Standard urban intersections (4-leg, T-junction, Y-junction)
- Suburban arterial crossroads
- Roundabout approach signals
- School zone and hospital zone signals
- Industrial park entry/exit control
- Public transport interchange signals
- Bridge and tunnel approach signals
- Expressway service-area entry signals
For multi-phase intersections requiring dedicated turn phases, see 4-aspect LED traffic light. For simpler stop/go control without a yellow phase, see 2-aspect LED traffic light.
Installation and Maintenance
Mount the head to the pole-top bracket with red uppermost. Cable entry through the bottom gland uses a 4-core cable (red live, yellow live, green live, neutral, earth) plus an optional control wire. Standard installation time is 25–40 minutes per head. Aiming adjustment is via the supplied mounting bracket slots.
Maintenance: visual inspection every 12 months, photometric verification every 5 years, and module replacement on failure. The driver electronics are conformal-coated and rated for 100,000 hours. Full installation guidance is in our LED Traffic Light Installation Guide.
Certifications and Compliance
Standard documentation package: EN 12368 test report, CE/RoHS/FCC certificates, ISO 9001 quality system reference, photometric data file, and a 3-year limited warranty. Saudi SASO, Brazil INMETRO, and other country-specific certifications are available on project basis. Each shipment is traceable to the production batch via the head's serial number plate.
Why Choose GAOQIAO
GAOQIAO is a Nanjing-based LED traffic light manufacturer with 17 years of production experience. Our 3-aspect heads are deployed in 60+ countries across Southeast Asia, the Middle East, Africa, Eastern Europe, and Latin America. Monthly production capacity is 15,000 standard heads, with consistent 15–25 day lead times for catalog products. OEM and ODM projects are supported above 100 units. For project references, see cooperation cases and company profile.