Traffic Signal Housing and LED Module/Core Specification Guide
A simple way to describe the signal head as housing plus electronic module, so purchasing and engineering compare like-for-like parts.
Housing and electronic module are different parts
A traffic signal head is normally an assembly: the housing provides mechanical protection, while the electronic module provides the optical indication. Depending on the design, the module includes the PCB or lamp board, red/yellow/green LEDs, power supply and plastic optical components. Specify both sides of the assembly when replacing or building a signal.
What to specify
| Part | Specification examples | Why it matters |
|---|---|---|
| Housing/body | 100/200/300/400mm, material, rear access, colour | Fit, weather protection and maintenance access |
| LED module/core | Red, yellow or green; ball, arrow or symbol; voltage | Optical indication and controller compatibility |
| Visor and lens | Visor depth, lens type and viewing angle | Sun glare control and visibility |
| Power and wiring | AC/DC input, terminal layout and cable entry | Safe integration with the controller |
Replacement checklist
- Measure the existing diameter and section count.
- Photograph the front face, rear housing and terminal labels.
- Record the existing voltage and controller output.
- Identify ball, arrow, pedestrian or bicycle indication.
- Confirm bracket, visor and cable-entry dimensions.
Use the traffic light product range, 100mm module and signal section, 200mm module and housing section, and 300mm signal section as starting points. The 300mm factory production guide shows a current batch, while the inspection checklist explains the evidence to retain. For a full project, send the drawing and photos for a configuration review.
Send a Housing and Module Specification
Measure the mechanical interface
Record the actual opening, fixing centres, available depth and access direction rather than selecting a replacement from its nominal diameter alone. Include photographs of the mounting points, lens, visor and cable entry. Where existing brackets must remain, provide their dimensions and the intended orientation. A module that fits the front opening may still interfere with rear wiring or maintenance access.
Define what a module includes
Ask whether the quoted module includes the optical face, LED board, driver or power supply, wiring and seals. Suppliers may use core, insert and module for different assemblies. Put the included parts in writing and identify anything that must be reused. For a complete signal, confirm the number of sections, symbol, housing material, brackets and interconnection between sections.
Check electrical and environmental requirements
Provide the existing label and supply specification, including AC or DC, voltage and terminal arrangement. Do not infer the input rating from the signal colour or physical size. State the installation environment and required documentation so the supplier can confirm the applicable configuration. The protection of a replacement part does not by itself establish the protection of a complete assembled enclosure; seals, cable entries and assembly conditions also need review.
Approve a replacement sample
Agree inspection points for dimensions, mounting, identification, indication and electrical operation before ordering a batch. Qualified personnel should compare the sample with the project requirements and the existing equipment. Record the accepted part number and any changes to the bracket, cable or seal arrangement. Do not approve substitution solely because the replacement illuminates during a brief demonstration.
Plan spare parts and traceability
Keep model references, approved drawings and sample photos with the purchasing record. Specify packaging that identifies similar-looking variants clearly, especially when several voltages or symbols are ordered together. Agree which spare components will be supplied and how they correspond to installed units. Send these records to GAOQIAO when requesting a repeat batch so the quotation can address the actual replacement configuration rather than an assumed equivalent.