LED Diffuser Sheet
Light-diffusing polycarbonate with diffusion uniformity above 95% — hides the LEDs, keeps the output.
A diffuser sheet has one job: make a row of point-source LEDs look like a single continuous surface of light. Our diffuser grade achieves diffusion uniformity above 95%, developed in-house rather than bought in as a masterbatch.
The difficulty is that hiding hotspots and keeping brightness pull in opposite directions. Load a sheet with enough diffusing particles to kill every hotspot and you lose output; use too few and the LED array shows through as a row of bright dots.
Specification
| Property | Specification |
|---|---|
| Diffusion uniformity | > 95% |
| Light transmission | 55–75% depending on grade (specify the balance you need) |
| Thickness | 1 mm – 5 mm |
| Widths | 1220 / 1560 / 1820 / 2100 mm (other widths made to order) |
| Colours | Milky white, ice white; custom diffusion levels to order |
| Base material | Virgin polycarbonate — will not yellow under continuous LED exposure |
| Fire behaviour | B1 available, required for most luminaire standards |
Specifying a diffuser correctly
Three numbers decide the grade, and a sample is worth more than a datasheet:
LED pitch — how far apart the diodes sit. Wider spacing needs more diffusion.
Cavity depth — the gap between LED and sheet. A deep cavity does much of the mixing for you and lets you use a brighter, less diffusing sheet.
Required output — every point of uniformity costs transmission. Tell us the lumen target and we will pick the trade-off rather than guessing.
Send those three and we will send diffuser samples to test in your actual fixture. Sample pieces of standard grades are free.
Typical applications
- LED panel lights and troffers
- Linear luminaires and cove lighting
- Backlit signage and lightbox faces
- Illuminated ceilings and wall panels
- Display backlighting units
Minimum order and lead time
This grade ships from 100 m² or 1 tonne — a trial pallet, not a full container. Standard sizes and stock colours run in 7–10 days; non-standard thickness or width in 12–18 days; add 3–7 days for CNC cut-to-size work. Quoted in USD on FOB, CIF or DDP terms. Full detail on the MOQ, lead time & shipping page.
Questions buyers ask
Why use polycarbonate rather than acrylic for diffusers?
Polycarbonate handles heat better and will not crack when a fixture is over-tightened or dropped during installation. Acrylic diffusers are cheaper and slightly brighter, and are a reasonable choice in cool, low-vibration fittings.
Will the diffuser yellow over time?
Not from LED exposure — our sheet is extruded from virgin polycarbonate. Yellowing in diffusers almost always comes from recycled base resin or from excessive fixture heat, not from the light itself.
Can you match the diffusion of my current supplier?
Send a sample of the sheet you use now and we will match transmission and uniformity, then send you a comparison piece before you order.