Light transmittance in diffuser sheet refers to how much visible light can pass through the sheet after entering the material. In LED lighting projects, it directly affects brightness, energy efficiency and final visual performance. A sheet with very high transmittance may look bright, but it may not hide LED dots well. A sheet with very low transmittance may reduce glare, but it can also lower lumen output.
Clear PMMA can reach about 92% light transmittance under ASTM D1003 testing. For diffuser sheet applications, the value is usually adjusted through formula design, surface texture and haze control. Many LED panel light projects use diffuser sheets with about 80%–92% transmittance, depending on LED spacing, fixture depth and target brightness.
| Transmittance Level | Common Effect |
|---|---|
| Higher transmittance | Better brightness and lumen output |
| Medium transmittance | Balanced brightness and diffusion |
| Lower transmittance | Stronger LED hiding and glare control |
| Unstable transmittance | Batch color difference and uneven lighting |
A trader may only provide a standard diffuser sheet from stock, but light transmittance needs to match the real fixture structure. A manufacturer can adjust transmittance, haze, thickness, surface texture and color tone according to project requirements.
KUNXIN manufactures Optical Plastic materials for LED lighting, including acrylic diffuser sheet, PC diffuser sheet, anti-glare diffuser sheet, Prismatic Diffuser Sheet and Light Guide Plate. Our team can review LED pitch, panel depth, wattage and brightness target before sample development.
A practical OEM / ODM process should begin with optical data confirmation. Buyers need to confirm target transmittance, haze level, sheet thickness, fixture size, LED spacing and testing method. Sample testing should compare brightness, visible LED dots, glare performance and color consistency before bulk order.
For bulk supply considerations, the project sourcing checklist should include optical data range, thickness tolerance, sheet flatness, surface defects, protective film, packaging strength and export documents. These details help keep lighting performance stable across repeated production.
During manufacturing, KUNXIN controls raw material selection, formula mixing, extrusion stability, cooling balance, thickness measurement, optical testing and final inspection. Quality checkpoints include luminous transmittance, haze, surface cleanliness, size accuracy, flatness and batch consistency.
ASTM D1003 is commonly used to test haze and luminous transmittance of transparent plastics. For export market compliance, stable material documents, clear batch labels and safe packaging help support delivery to Europe, North America and other overseas lighting markets.
Light transmittance should never be selected alone. The best diffuser sheet must balance transmittance, haze, thickness and LED layout. For stable LED lighting projects, working with an optical plastic manufacturer helps control brightness, uniformity and bulk supply consistency from sample testing to export delivery.
