Choosing the right diffuser material is an important step in developing LED linear lights, panel lights, tube housings and other lighting products. Polycarbonate (PC) and acrylic (PMMA) are two common options for extruded lighting covers, but they offer different performance characteristics. The best choice depends on the fixture design, operating environment, optical requirements and production method.
For lighting manufacturers, comparing these materials before finalizing the extrusion design can help reduce development changes and improve product consistency.
Both PC and acrylic can be formulated or processed for transparent, frosted and diffusing applications. However, total light transmission alone does not determine the quality of a lighting cover.
A clear cover is designed to transmit light with limited scattering, while a diffusion cover helps distribute light more evenly and reduce the visibility of individual LED points. Surface texture, wall thickness, diffusion additives and the distance between the LEDs and cover all influence the final optical result.
When evaluating an LED diffuser material, manufacturers should consider light transmission, uniformity, glare control and the appearance of the finished fixture together.
Polycarbonate is generally selected when impact resistance is a major design consideration. It can be suitable for lighting covers used in workshops, commercial facilities, public areas and other environments where components may experience accidental impacts.
Acrylic offers good optical clarity and weathering performance in appropriately formulated grades. It is often considered for decorative fixtures, architectural lighting and applications where appearance and light transmission are priorities.
Neither material should be selected on a generic material name alone. The actual grade, processing conditions, wall thickness and service environment can affect performance.
For outdoor linear lighting, UV exposure, temperature variation, moisture and long-term appearance are important factors. Acrylic grades with suitable weathering characteristics may be appropriate for certain exposed applications, while UV-stabilized PC grades may be considered where impact resistance is also important.
Material selection should be based on the intended environment and validated through relevant testing. A standard grade should not automatically be assumed to provide outdoor durability, UV resistance or a specific service life.
Material selection also affects extrusion tooling and production. Profile geometry, wall thickness, dimensional tolerances, surface finish and cooling conditions must be considered when developing a custom lighting cover.
Depending on the project, manufacturers may require transparent, frosted, matte, prism-textured, light-diffusing or dual-color extruded profiles. These options should be evaluated alongside the intended material and production process.
For OEM lighting projects, providing a cross-sectional drawing or sample can help the extrusion manufacturer assess tooling feasibility and identify design requirements before production begins.
Consider the following factors before making a final decision:
●Impact requirements: Evaluate the expected mechanical stress and the need for resistance to accidental impacts.
●Optical performance: Define the required transparency, diffusion, glare control and visual appearance.
●Environmental exposure: Specify indoor or outdoor use, UV exposure and operating temperatures.
●Processing method: Confirm compatibility with extrusion, co-extrusion or other intended manufacturing processes.
●Cost and production volume: Evaluate material cost, tooling investment, expected order quantities and production consistency.
Jiangmen Xinchen Plastic Electronic Technology Co., Ltd. provides plastic material modification, extrusion mold development and customized extrusion product manufacturing. Its product range includes PC and acrylic lighting covers, diffusion materials and other extrusion solutions.
For a project-specific assessment, prepare your profile drawing, required dimensions, optical expectations, application environment and estimated order quantity. Xinchen can use these details to discuss material options, tooling requirements and quotation scope.
Contact Xinchen to discuss your custom LED diffuser extrusion project and request a quotation.
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