For most of the 20th century, traffic signals used incandescent halogen lamps. Since 2010, LED technology has matured to the point where the halogen traffic light is essentially obsolete in new installations. Yet many procurement specifications still reference halogen parameters, and some municipal budgets are still pricing halogen units. This article gives you the complete technical, economic, and operational case for LED as the only sensible choice in 2026.
A 12-inch (300mm) red halogen traffic signal head draws approximately 150 watts. The LED equivalent draws 10-15 watts. Across a typical intersection with 12 signal heads (4 directions, 3 aspects each), the daily energy consumption drops from 43.2 kWh to 3.6-4.3 kWh. Over a year, that is the difference between USD 1,500-2,500 in electricity per intersection (depending on local rates) and USD 120-200.
For a city operating 5,000 intersections, the annual energy savings from LED conversion exceed USD 5 million. The payback period on the LED premium is typically 2-4 years from energy savings alone, before counting maintenance savings.
GAOQIAO's LED traffic signals are rated for 100,000 hours of operation. At typical intersection duty cycles (the lamp is on 24/7, regardless of signal state), this is approximately 11.4 years of continuous operation. Halogen lamps last 2,000-8,000 hours depending on vibration and voltage conditions, requiring 12-50 replacements over the same period.
Real-world data from a deployment of 800 LED signal heads in Saudi Arabia (2018 installation): zero LED module replacements through 2025. Estimated full-life operating cost: 12% of the equivalent halogen installation.
LED traffic signals are visibly brighter than halogen in daylight conditions, particularly in direct sunlight. This is the safety dimension that often gets overlooked: a more visible signal reduces red-light running and pedestrian crossing violations. Independent studies from the US Department of Transportation and the German BASt confirm 10-15% reductions in signal-related traffic violations after LED conversion.
LEDs also maintain their color purity over time. A halogen lamp shifts toward yellow as the filament ages, and a UV-degraded lens adds further color distortion. An LED module maintains its specified chromaticity coordinates throughout its lifespan.
The single largest operational cost difference between LED and halogen is maintenance. A halogen signal head requires:
An LED signal head requires:
LED traffic signals reduce CO2 emissions by approximately 80% over halogen, primarily through reduced electricity generation. A single LED conversion of 1,000 intersections reduces CO2 by 5,000-8,000 tonnes annually. Additionally, LED modules contain no mercury (unlike CFL or certain HID alternatives) and can be recycled at end of life as standard electronic waste.
There are only two scenarios where halogen remains technically defensible in 2026:
For all other scenarios, LED is the unambiguous choice. The total cost of ownership over 15 years is 3-5x lower for LED, the safety performance is superior, and the environmental footprint is dramatically smaller.
For cities with existing halogen installations, GAOQIAO recommends a phased conversion prioritized by intersection accident history, traffic volume, and energy cost. Our retrofit kits are designed for direct replacement of halogen heads using existing mounting hardware and wiring, requiring only 15-30 minutes per head for installation. A typical 4-way intersection can be converted in one maintenance shift.
A: Yes, modern LED traffic signals operate reliably from -40 to +80 deg C. GAOQIAO specifies automotive-grade LED chips and conformal-coated drivers for cold-climate deployments. We have installations in Mongolia, Siberia, and Northern Canada that have performed reliably for 8+ years.
A: Yes, in most cases. GAOQIAO retrofit heads use the same mounting hardware, the same wiring colors, and the same voltage inputs as standard halogen units. The only adjustment needed is configuring the controller for LED load detection (which most modern controllers support via a software setting).
A: Modern LED traffic signals include degradation monitoring: the controller receives a signal when the LED output drops below 70% of specification, allowing scheduled replacement rather than emergency response. This is a significant advantage over halogen, which fails suddenly without warning.
About GAOQIAO — Nanjing Gaoqiao Traffic Technology Co., Ltd. is a Chinese traffic-signal manufacturer with 17+ years of export experience across 60+ countries. About page | Cooperation inquiries
Last updated: 2026-06-29 — Reviewed by the GAOQIAO engineering team.