Light diffusion performance should not be judged by transparency alone. PMMA and PC can both be used for LED diffuser sheets, but they perform differently in brightness, haze, impact resistance, heat stability, processing, and final lighting comfort.
PMMA is usually preferred when a lighting product needs higher optical efficiency and a clean surface appearance. Clear PMMA sheet can reach about 92 percent light transmission under ASTM D1003 testing, and ASTM D1003 is the standard method used to evaluate haze and luminous transmittance in transparent plastics. This makes PMMA suitable for LED panel lights, light boxes, advertising lighting, ceiling lamps, and decorative lighting covers where brightness and visual clarity are important.
PC is stronger when the lighting structure requires higher impact resistance or better safety performance. Clear polycarbonate sheet is commonly measured at about 88 to 89 percent light transmission under ASTM D1003, while impact strength is much higher than PMMA in many engineering applications. For public lighting, industrial lighting, transportation lighting, or fixtures that may face vibration and installation stress, PC diffuser sheet is often a safer choice.
Material comparison for LED diffusion:
PMMA diffuser sheet: higher light efficiency, smooth appearance, easier polishing, good weather resistance, suitable for indoor commercial lighting and display lighting.
PC diffuser sheet: stronger toughness, better impact resistance, higher heat resistance, suitable for industrial fixtures, public spaces, protective lighting covers, and demanding installation environments.
Professional selection should start from the lamp structure. If LED spacing is large and the fixture depth is shallow, the sheet needs stronger haze to hide light spots. If the lighting design requires high lumen output, transmission should not be reduced too much. A good Light Diffuser Sheet must balance transmission and haze, rather than simply choosing the clearest material.
KUNXIN provides PMMA diffuser sheet, PC diffuser sheet, Prismatic Diffuser Sheet, Anti-Glaring Diffuser Sheet, optical acrylic sheet, polycarbonate sheet, and customized light diffusion materials for LED lighting manufacturers. Our factory can adjust thickness, haze, transmission, surface texture, color, cutting size, and processing method according to the actual lighting structure. For bulk order production, we focus on batch consistency, stable optical performance, precise thickness control, and clean sheet surface.
For most indoor LED panel lights and decorative lighting projects, PMMA is better when brightness and appearance are the priority. For lighting products that need higher safety, stronger impact resistance, or tougher installation performance, PC is the better material. KUNXIN can help project buyers test samples, compare optical data, and confirm the right diffuser sheet before mass production.
Share your fixture size, LED spacing, target light transmission, haze requirement, and installation environment with KUNXIN. Our team can recommend a suitable PMMA or PC diffuser sheet solution for your lighting project.
