Introduction
A lens is part of the signal head’s optical assembly. Review its material, surface design and LED configuration together when selecting a new signal or replacing a lens.
Glass vs Polycarbonate
Confirm the material and grade supplied for the quoted model. Compare the documented optical properties, impact performance, surface durability and environmental suitability against the project specification.
For a replacement, confirm the lens profile, fixing points, gasket and housing against the model drawing. Changing the material also requires a review of the assembled signal’s optical performance.
Beam Patterns
Compare the model’s luminous-intensity distribution at the horizontal and vertical angles required by the project. Include the indication, signal aiming and intended approach in the review with the project engineer.
Ask for applicable photometric data and test documentation for the quoted configuration. Confirm the required standard, edition and performance class for the destination; the model and test configuration must match the order.
Lens Diameter and Visibility
Use the approved project plan to choose the signal diameter. Review sight distance, approach geometry, mounting and aiming, background conditions and the selected model’s optical data together. A diameter alone is insufficient to specify a universal viewing distance.
Featured Products
Compare the 200mm (8-inch) and 300mm (12-inch) product ranges, then confirm the exact lens, indication and electrical configuration. For projects requiring a larger size, review the 400mm and 500mm range against the project specification.
Before requesting a quotation
Send the specified diameter, indication, mounting details and optical requirements. For replacement work, include the installed label, lens and housing photographs, critical dimensions and drawing reference so the proposed configuration can be checked.
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Frequently Asked Questions
Are polycarbonate lenses as clear as glass?
Compare the optical data for the supplied material grade, lens design and surface condition. Request the relevant transmittance or assembled-signal photometric information for the quoted configuration.
Can I replace a glass lens with a polycarbonate lens?
Confirm the lens profile, thickness, fixing points, gasket and housing revision against the model drawing. Have the proposed assembly and its optical configuration reviewed before approving the replacement.
What beam pattern do I need for a left turn signal?
Use the approved movement plan and required viewing angles. Review the arrow indication, signal placement and aiming, and the model photometric data with the project engineer.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal headsCompare 200mm and 300mm configurations, then confirm the selected model documentation and project requirements.
- Signal polesCompare pole and arm configurations against the project geometry, loading and mounting requirements.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.