Updated 12 October 2026 · GAOQIAO Traffic Technology
An LED traffic light should be purchased against a defined project specification, not a photograph or a promise of high brightness. The most useful comparison begins with the indication, optical size, electrical interface and installation arrangement. Price becomes meaningful only after suppliers are quoting the same assembly and evidence package.
For overseas buyers comparing 200mm and 300mm products, the following process turns a broad catalogue search into a specification that a manufacturer can review.
Define the equipment boundary
A quotation for a complete signal head is different from a quotation for an LED module. Identify whether the order includes the housing, visor, brackets, cable, connectors and any countdown display. State whether the equipment is for a new installation, a planned replacement or spare stock.
Keep the signal head separate from the controller, detection equipment and communications platform in the bill of materials. A modern control system does not remove the need to specify the field hardware correctly.
Select the indication before comparing sizes
Record the approved indication for each position: full ball, directional arrow, pedestrian symbol or another project-defined display. Include the number and order of aspects. An aspect is a physical display section; it should not be treated as interchangeable with a controller phase.
Compare 200mm LED traffic lights and 300mm LED traffic lights against the project drawings and authority requirements. Diameter alone does not establish suitability, viewing performance or installation clearance.
Match evidence to the exact model
Request the model number, drawing revision, input specification and relevant optical or environmental documentation. If a report is required by the project, check which model, configuration and conditions it covers. A generic certificate image is not a substitute for a model-specific review.
For U.S. projects, FHWA identifies the December 2025 MUTCD 11th Edition with Revision 1 as its current edition. The buyer should confirm the applicable authority requirements rather than treating a supplier’s catalogue as the governing specification. See the official FHWA edition page.
Resolve the electrical and mechanical interfaces
Specify the supply type and range, controller output characteristics, terminal identification and any dimming or monitoring requirement. Request a wiring diagram for the selected version. Do not derive an installation connection from wire colour alone.
For replacements, measure the retained housing, retaining arrangement, sealing surfaces and cable entry. For complete heads, check mounting interfaces, access space, weight and bracket scope against the approved support design.
Release a clear purchase package
Before ordering, assemble the approved schedule, drawings, evidence requirements, quantities and delivery destination. Record substitutions explicitly. State how the sample and shipment will be accepted, including which checks belong to the manufacturer and which belong to the project team.
Start with GAOQIAO’s LED traffic light range and send the project schedule to sky-sale@njgq.net. Include the required size, indication, electrical version, installation drawings and quantity so the team can review a defined configuration.
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