Polycarbonate LED Light Diffuser Sheet

Polycarbonate LED Light Diffuser Sheet

HSQY polycarbonate LED light diffuser sheet is an optical PC sheet designed to spread light from LED point sources into a softer and more uniform illuminated surface. It helps reduce visible LED hotspots and glare while maintaining useful light transmission for panel lights, ceiling lamps, downlights, light boxes, signage and architectural lighting.

The current HSQY diffuser sheet specification offers approximately 82%-88% light transmittance and 90%-94% haze, with opal and customized colors, matte/matte or glossy/matte surfaces, thicknesses from 1.5mm to 12mm and widths up to 2100mm. Custom thickness, size and optical requirements can be discussed for LED lighting manufacturers, luminaire brands, signage companies and OEM projects.

Polycarbonate LED Diffuser Sheet Video

What Is a Polycarbonate Light Diffuser Sheet?

A polycarbonate light diffuser sheet is an optical plastic panel designed to scatter and redistribute light passing through the material. In an LED fixture, individual LEDs act as small point light sources. Without sufficient diffusion, these points can remain visible as bright spots or hotspots through the cover.

A diffuser sheet helps mix the light before it leaves the luminaire, producing a more even illuminated appearance. The optical design needs to balance two competing requirements: sufficient diffusion to hide LED points and sufficient transmission to avoid unnecessary loss of usable light.

Polycarbonate is particularly suitable for lighting covers where impact resistance, dimensional stability and fabrication performance are required in addition to optical diffusion.

For thinner optical applications, HSQY also supplies            optical grade polycarbonate film        in thicknesses from approximately 0.05mm to 2mm.

Polycarbonate LED Diffuser Sheet Images

Polycarbonate Diffuser Sheet Specifications

HSQY supplies polycarbonate diffusion sheets in multiple thicknesses and widths for LED fixtures, illuminated signage and architectural lighting. Optical performance should be selected together with LED spacing, diffuser-to-LED distance and required finished-luminaire brightness.

Light Transmission vs Haze in LED Diffuser Sheets

Light transmission and haze are two of the most important specifications when selecting an LED diffuser sheet, but they describe different optical characteristics.

What Does Light Transmittance Mean?

Light transmittance describes the proportion of incident visible light that passes through the diffuser sheet. Higher transmission generally helps retain fixture brightness, but transmission alone does not indicate how evenly the light is distributed.

What Does Haze Mean?

Haze describes how strongly transmitted light is scattered. A high-haze diffuser can help obscure individual LED points and create a more uniform luminous surface.

Why Must Transmission and Diffusion Be Balanced?

A diffuser that scatters light very strongly can provide good LED hiding performance but may also reduce useful light output. A material with very high transmission but insufficient diffusion may leave visible LED hotspots. The correct diffuser therefore depends on the optical design of the complete luminaire.

How a PC Diffuser Helps Hide LED Hotspots

LED arrays consist of multiple individual light sources. If the diffuser is too transparent, too close to the LEDs or insufficiently diffusive, users may see the LED positions as individual bright dots.

A suitable polycarbonate diffuser scatters the light from neighboring LEDs so that their individual light distributions overlap before leaving the fixture. This helps transform multiple point sources into a more continuous luminous surface.

Optical performance is therefore determined not only by the diffuser sheet but also by LED pitch, LED beam angle, sheet thickness, diffusion grade and the distance between the LED board and diffuser.

LED Spacing and Diffuser Distance

The distance between the LEDs and diffuser sheet is an important part of luminaire design. Increasing the mixing distance generally gives light from neighboring LEDs more opportunity to overlap, which can improve uniformity and reduce visible hotspots.

However, fixture depth, LED output, beam angle and diffuser properties are different for every lighting product. HSQY recommends testing diffuser samples in the actual fixture rather than selecting a sheet solely from a transmission or haze number.

Key Advantages of Polycarbonate LED Diffuser Sheet

Uniform Light Distribution: The diffuser helps redistribute light from individual LEDs to reduce bright spots and create a softer luminous surface.

High Haze: The current HSQY specification lists approximately 90%-94% haze, supporting strong visual diffusion and LED hiding performance.

Useful Light Transmission: The current product specification lists approximately 82%-88% transmission, designed to maintain useful output while providing diffusion.

Impact-Resistant PC Material: Polycarbonate provides greater resistance to impact than brittle lighting-cover materials, which can be useful for commercial and industrial fixtures.

Multiple Surface Options: Matte/matte and glossy/matte configurations allow lighting manufacturers to select different visual and surface effects.

Large Sheet Sizes: Widths up to 2100mm support larger light boxes, ceiling lighting panels and architectural applications.

Custom Processing: Sheet dimensions, thicknesses and selected optical requirements can be discussed for OEM lighting projects.

Applications of Polycarbonate Diffuser Sheet

Polycarbonate diffuser sheet is used wherever a lighting manufacturer needs to soften, scatter or homogenize light while maintaining a durable plastic cover.

• LED panel lights.

• LED ceiling lights.

• Downlights and recessed luminaires.

• Office lighting fixtures.

• Kitchen and residential lighting.

• Industrial lighting covers.

• Advertising light boxes.

• Illuminated signage and displays.

• Architectural lighting panels.

• Decorative lighting and stage effects.

• LED electronic display-related optical covers.

Polycarbonate vs Acrylic Light Diffuser Sheet

Polycarbonate and PMMA acrylic are both widely used as lighting diffuser materials. The best material depends on the required optical performance, impact resistance, fixture environment and cost target.

Matte vs Glossy Polycarbonate Diffuser Surface

How to Select a Polycarbonate LED Diffuser Sheet

Selecting the correct diffuser requires more information than sheet thickness alone. Lighting manufacturers should evaluate the diffuser as part of the complete optical system.

Why Sample Testing Is Important

The same diffuser can perform differently in two LED fixtures because LED pitch, distance, output and reflector design may be different. For this reason, optical values alone should not be used as the final approval criterion.

HSQY recommends installing material samples in the actual luminaire and evaluating hotspot hiding, luminance uniformity, total brightness, color appearance and visual comfort before confirming mass production.

Custom Polycarbonate Diffuser Sheet for OEM Lighting

HSQY supports B2B lighting manufacturers, fixture assemblers, signage manufacturers and distributors with customized polycarbonate diffuser sheet specifications.

Buyers can discuss thickness, sheet width, cut dimensions, opal appearance, surface finish and required optical performance. For new lighting projects, providing an existing diffuser sample or target transmission/haze specification can help accelerate material matching.

Information Required for a Diffuser Sheet Quote

• Required thickness.

• Sheet width and length.

• Required light transmittance.

• Required haze or LED hiding target.

• Matte/matte or glossy/matte surface.

• Fixture type and application.

• LED pitch and diffuser-to-LED distance where available.

• Indoor or outdoor application.

• Applicable fire, UV or compliance requirements.

• Order quantity and estimated annual consumption.

• Destination port or country.

Packaging and Delivery

Sample Packaging: Polycarbonate diffuser sheet samples can be protected with PE bags and kraft paper and packed in cartons.

Sheet Packaging: The current reference packaging is approximately 30kg per bag or according to customer requirements.

Pallet Packaging: Reference pallet weight is approximately 500-2000kg depending on sheet size, thickness and packing configuration.

Container Loading: Bulk orders can be optimized for 20ft or 40ft containers according to sheet dimensions and legal loading limits.

Delivery Terms: FOB, CIF and EXW options are available.

Reference Lead Time: Approximately 7-15 days after deposit depending on specification, size and order volume.

Certifications and Quality Documentation

Available certification and test documentation depends on the selected polycarbonate diffuser grade. If your lighting project requires specific SGS, RoHS, REACH, UL 94, UV resistance or other performance documentation, please provide the required standard before ordering.

Buyers should confirm that the supplied document applies to the exact material specification and production grade rather than assuming that one certificate applies to every polycarbonate diffuser sheet.

HSQY Plastic Group Global Exhibitions

HSQY Plastic Group meets lighting manufacturers, plastic distributors, converters and industrial customers at international exhibitions to discuss polycarbonate sheet specifications, optical requirements, customized projects and long-term supply cooperation.

Frequently Asked Questions About Polycarbonate Diffuser Sheet

What is a polycarbonate LED diffuser sheet?

It is an optical polycarbonate sheet designed to scatter LED light and create a more uniform illuminated surface. It helps reduce visible LED points, hotspots and harsh glare.

What is the light transmittance of HSQY PC diffuser sheet?

The current product specification lists approximately 82%-88% light transmittance. Exact optical performance should be confirmed for the selected thickness, color and diffuser specification.

What is the haze of the diffuser sheet?

The current HSQY product specification lists approximately 90%-94% haze. High haze helps scatter transmitted light and improve LED hiding performance.

Does higher haze always mean a better LED diffuser?

No. Higher haze can improve diffusion and LED hiding, but a lighting fixture also needs sufficient transmitted light. The best diffuser balances brightness, diffusion and hotspot control for the specific LED configuration.

Will the diffuser completely hide individual LEDs?

LED hiding depends on diffuser performance as well as LED pitch, beam angle, brightness and the distance between the LED board and diffuser. Sample testing in the finished fixture is recommended.

What thicknesses are available?

Current standard thicknesses include 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm and 12mm. Customized thicknesses can be discussed according to production feasibility.

What is the maximum sheet width?

HSQY currently lists standard widths of 1220mm, 1560mm, 1820mm and 2100mm, allowing the material to be used for both conventional luminaires and larger illuminated panels.

What surface finishes are available?

The current product offers matte/matte and glossy/matte surface configurations. The best surface depends on the required appearance, glare control and fixture design.

Is polycarbonate better than acrylic for LED diffusers?

Neither material is universally better. Polycarbonate is commonly selected where higher impact resistance and tougher fixture covers are required, while acrylic may be selected for other optical or cost requirements. The correct choice depends on the complete luminaire specification.

Can HSQY customize the light transmission and haze?

Customized optical requirements can be discussed according to order volume and production feasibility. Providing the target transmission, haze, existing sample or finished-fixture requirements helps HSQY evaluate the appropriate diffuser specification.

Can I get samples for testing in my LED fixture?

Sample availability can be confirmed according to thickness, surface and optical specification. Testing the diffuser in the actual lighting fixture is recommended before mass production.

Can this sheet be used for outdoor lighting?

Outdoor applications may require UV-stabilized polycarbonate and additional weatherability requirements. Confirm the required outdoor service conditions and applicable material grade before ordering rather than assuming that every diffuser grade is UV stabilized.

Is every polycarbonate diffuser sheet flame retardant?

No. Flame performance depends on the specific polycarbonate formulation, thickness and test method. If your fixture requires a particular UL 94 or other fire classification, specify the required rating when requesting a quote.

What information is required for a quotation?

Please provide thickness, width, length, surface finish, required transmission and haze, lighting application, LED configuration if available, annual quantity, certification requirements and destination port.

Why Buy Polycarbonate LED Diffuser Sheet from HSQY?

HSQY supplies polycarbonate diffuser sheets for LED lighting manufacturers, illuminated-sign companies, distributors and OEM projects. Customers can discuss thickness, width, cut dimensions, opal appearance, surface finish and optical performance according to the finished lighting product.

Send HSQY your LED fixture type, existing diffuser sample or optical target, required dimensions and annual purchasing volume. Our team can help evaluate the appropriate specification and prepare material samples and a quotation.