Is Higher Light Transmittance Always Better for LED Light Diffuser Plates?

      

When selecting an LED light diffuser plate, light transmittance is often the first thing customers consider. Many assume that higher transmittance equals better performance — but this is not entirely true.
While higher light transmittance can indeed improve brightness and luminous efficiency under the same lighting conditions, it’s only one factor in evaluating a led light diffuser sheet. Another crucial element is light uniformity, which plays a key role in achieving high-quality lighting.

Why is Light Uniformity Important for LED Light Diffuser Plate?
Light uniformity determines whether the illumination is smooth and consistent, without uneven bright or dark areas or visible LED hotspots. This significantly impacts both lighting quality and product aesthetics.

Generally, higher transmittance results in lower haze, which reduces diffusion and may cause uneven lighting. On the other hand, lower transmittance increases haze, enhancing diffusion and improving uniformity. Therefore, the ideal led light diffuser sheet strikes a balance between transmittance and light uniformity, based on the specific application.

How to Choose the Right LED Light Diffuser Plate: Match Optical Material to Distance and Design

1. Direct-lit LED Applications

• Distance > 35 mm from light source:
  Use light diffuser sheets with high-transmittance like YONGTEK PA-90S2 、PA-00B or PAA-90SK for excellent brightness and uniform light diffusion.
• Distance 25~30 mm:
  Choose led light diffuser sheets with medium transmittance (~75%) such as YONGTEK PA-75S2、PA-90B or PAA-75SK to balance brightness and uniformity.
• Distance < 25 mm:
  To reduce visible hotspots, use lower transmittance led light diffuser plates like YONGTEK PA-55S2 for enhanced diffusion.
• Distance about 10 mm (For Mini LED):
  Yongtek PEC-60S2 or PEC-40S2, specially designed for ultra-short distance and high-density light sources.

2. Edge-lit LED Applications

• With laser-etched or printed light guide plates:
  Choose ~75% transmittance light diffuser sheets like YONGTEK PA-75S2 or PAA-75SK to hide dot patterns and improve uniformity.
• With hot-pressed or micro-structured light guide plates:
  Use high-transmittance diffuser sheets such as YONGTEK PA-90S2 or PAA-90SK for optimal light efficiency and uniform distribution.
  
  

Why Choose YONGTEK LED Light Diffuser Plates?

YONGTEK, a leading brand in Taiwan, specializes in the development and manufacturing of LED light diffuser sheets. With years of experience in optical materials, we offer a wide range of materials, light transmittance levels, and haze options to suit various Led lighting fixtures, Led displays, and Led signage applications.

We provide not only Led light diffuser sheets but also optical films and precision cutting services, offering customized solutions to meet your unique product requirements — all with fast turnaround.

Product Highlights

• Multiple light transmittance options (55%–90%) for different optical needs
• Excellent light uniformity — eliminates hotspots and enhances lighting quality
• Custom sizing and cutting available with rapid delivery
• Ideal for direct-lit and edge-lit LED light fixtures, Mini LED devices, Led light boxes, and Led display backlighting

YONGTEK is committed to delivering complete optical diffusion solutions to help make your products more competitive. Contact us today for tailored recommendations and product samples to support your LED diffuser plate and optical film needs.