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UGR<19 LED Panels: Opal Film & Prismatic Lens Solutions

• Indoor LED Lighting Solutions

Achieving a UGR<19 compliant luminaire with a premium opal light effect requires precise engineering and the right combination of optical materials. Modern LED panels must balance efficiency, visual comfort, and aesthetic consistency, making the pairing of optical films and prismatic sheets essential for high-performance lighting systems.

In most high-quality UGR<19 LED luminaires, the opal effect is created through a carefully selected mix of a translucent or semi-opal optical diffusion film and a solid prismatic diffuser sheet. Each layer plays a specific role in shaping how light is distributed, controlled, and perceived.

The Role of the Prismatic Diffuser Sheet

A clear prismatic sheet is the foundation for controlling beam angle and minimizing glare. Its micro-structured surface redirects light into the desired distribution pattern while preserving luminous efficiency.

Key functions include:

  • Precise beam angle formation
  • High-angle glare reduction
  • Compatibility with UGR<19 design requirements
  • Increased optical efficiency

This makes the prismatic sheet essential for architectural, office, and commercial lighting applications where visual comfort is a priority.

The Role of the Opal Optical Diffusion Film

The optical diffusion film complements the prismatic sheet by softening and blending the light produced by LEDs. Without this film, visible LED hotspots can break the uniformity of the panel, reduce visual comfort, and compromise the premium appearance expected in modern luminaires.

The diffusion film contributes to:

  • Hotspot elimination
  • Smooth, uniform light output
  • Aesthetic opal glow
  • Enhanced comfort for workplaces and public spaces

When combined, the prismatic diffuser and optical film create a high-quality lighting effect that meets both technical and visual expectations.

Hexatron’s Optical Solutions for UGR<19 Lighting

At Hexatron, we supply both prismatic diffuser sheets and optical diffusion films specifically developed for UGR<19 LED panel designs. Our materials ensure stable optical performance and smooth integration into different LED panel structures.

Depending on customer requirements, the components can be:

  • Assembled mechanically, using pressure from the frame
  • Bonded together, creating a unified optical element

Bonding is optional and recommended for certain specialized luminaires, but not required for most LED panels.

Assembly in LGP-Based LED Panels

In LED panels that include a Light Guide Plate (LGP), bonding is generally unnecessary. The optical stack consisting of:

  • Reflective film
  • LGP
  • Optical diffusion film
  • Prismatic sheet

is held securely in place by the frame, clamps, or metal housing. This simplifies production, reduces labor, and maintains optical alignment.

Prismatic Lens Options: Honeycomb & Pyramid Profiles

Hexatron offers two primary prism profiles to support different lighting needs:

1. Honeycomb-Shaped Prism Profile

This structure provides excellent multi-directional diffusion and a distinctive aesthetic.

  • Ideal for premium and custom lighting solutions
  • Delivers excellent UGR performance
  • Currently custom-produced, allowing tailoring to specific requirements

2. Pyramid-Shaped Prism Profile

This is the most widely used prism design in commercial lighting.

  • Excellent glare control and light shaping
  • Supports consistent UGR<19 results
  • Available with standard molds
  • Inventory available for reduced lead time and lower tooling costs

Example of Material Combination

One of the most effective optical stacks for UGR-compliant panels is:

Plexi Honeycomb Prismatic Sheet + Opto90 PET225 Optical Film

This pairing provides:

  • Outstanding glare control
  • Uniform and soft light distribution
  • A premium opal diffusion effect
  • Architectural-grade aesthetics

Ideal applications include:

  • Indoor LED lighting
  • Office ceiling panels
  • Retail and commercial luminaires
  • Architectural fixtures requiring UGR<19 compliance

Conclusion

Combining a high-quality prismatic sheet with a premium opal diffusion film is essential for creating UGR<19 compliant LED luminaires with smooth, visually comfortable light output. With options such as honeycomb and pyramid prism profiles—and professional-grade materials like Opto90 PET225—Hexatron provides reliable solutions for high-performance architectural and office lighting.