Pyrasied specialises in light diffusers, high-quality plastics that diffuse, bundle or change the direction of light. These light diffusers offer an optimum balance between high light transmission and good diffusion or bundling of light. Of course without the light source being disturbingly visible.
High-quality solutions for spreading and directing lightLargest stock of light diffusers, opal sheets and textured sheetsCut to size, lasered or milled 
Show products made of 100% recycled plastic.
The quality of our light diffusers is exceptionally high which is due to the use of nanotechnology, precise processing and the very best additives and raw materials.
We stock the right light diffuser for every application. With the required material properties, minimal light loss, absolute colour purity and cut to size or machined into finished products. We have our own lighting laboratory and test rigs. This allows us to check the quality of the diffusers: light colour, diffusion and transmission, between batches or production series. We are also happy to provide advice on the uniform illumination of our diffusers.
Light diffusers: choice of material and properties
At Pyrasied, we offer a wide range of light diffusers made from high-quality plastics such as acrylic (PMMA), polycarbonate and PETG. Each material has specific properties, so we can always supply a diffuser that fully meets the requirements of your application. Our stock includes various thicknesses, light transmission, shapes and surface textures.
Acrylic: optimum lighting technology
Acrylic is our starting point for material selection because of its excellent lighting properties. The material is 100% colourless, UV stable, temperature resistant up to 80°C, rigid, chemical resistant and fully recyclable. With a fire classification E according to EN13501, it combines safety with maximum light transmission.
Polycarbonate: impact-resistant and flexible
Polycarbonate is ideal when a diffuser needs to be impact resistant or a higher fire rating (Bs1d0) is required. The material can withstand temperatures up to 120°C and has minimal thickness tolerance. Polycarbonate is less rigid than acrylic, allowing it to be cold bent. Many of our polycarbonate diffusers are produced UV-resistant.
PETG: safe and versatile
PETG is particularly suitable for applications where low toxicity in case of fire is required, such as in airports. The material is also food-grade certified and has good hot-bendability, with a maximum use temperature of 70°C.
Diffuser types: standard, professional and advanced
Key terms
Practical application
The distance between LEDs and diffuser depends on transmission and application. For a standard solution with approx. 30% transmission, the distance between LEDs is equal to the distance to the diffuser plate.
A diffuser turns a non-egal light source into an evenly illuminated surface. Choosing the right type depends on several factors: type of light source, beam angle, spacing, placement options, desired light output, fire rating, impact resistance, indoor or outdoor use, maintenance and service life.
Stock and service
Our extensive stock includes diffusers in plates, tubes and round bars with a variety of characteristics. Thus, we offer maximum flexibility for virtually any application.
Light diffusers come in different materials, namely acrylic, polycarbonate, PETG and PS.
These plastics have different properties, so the requirements of an application can always be met. The diffusers are in stock in various thicknesses, light transmission, shapes and surfaces.
Acrylic has the best light-technical properties. The starting point for our choice of material is therefore always acrylic.
Acrylic has a very high light transmission and is completely 100% colourless. It is UV-stable, colourfast, temperature resistant up to 80ºC, quite rigid, resistant to many chemicals and 100% recyclable. The fire classification of acrylic is E according to EN13501.
We recommend polycarbonate if the light diffuser needs to be impact-resistant. Or when a fire classification Bs1d0 is required.
Polycarbonate has a higher temperature resistance, namely 120ºC, and has hardly any thickness tolerance. Polycarbonate is less rigid and is therefore cold-bendable. Polycarbonate is not UV-stable by itself, but many of our polycarbonate light diffusers are produced UV-proof.
PETG has the advantage of releasing less toxic gases in case of fire than polycarbonate. This is why only PETG may be used at airports, for example. Another big advantage of PETG is that this plastic is food grade certified. In addition, it bends well when hot; the user temperature is maximum 70ºC.
Light transmission is the amount of light measured on the other side of the light diffuser than where the light source is located. In other words, the percentage of light passing through the plate.
Diffusion is light scattering. The most common requirement for light diffusers is that the dots of the LEDs should no longer be visible. But that is not enough. The light surface must also be even. You can read more about this in the question: "How should I light evenly?".
The efficiency of the light diffuser is the degree of light transmission multiplied by the diffusivity. The higher the number, the more efficient the diffuser is. After all, that is our goal, to maximise light transmission and diffusion.
The half-value angle has to do with how wide the light radiates. In illuminated advertising, for example, the advertising should always be well perceived. Then you want the half-value angle to be as wide as possible.
With lighting, we want the light to go only where we want it. So a limited half-value angle.
The half-value angle is also important when determining the UGR value (unified glare rate). This is a standard that certain lighting must meet. A number of our diffusers help achieve the right UGR standard.
The UGR value (unified glare rate) is a measure of direct glare from luminaires. It is a standard that certain lighting must meet. A number of our diffusers help achieve the right UGR standard.
Because there are many different applications and many different light sources with varying light spectra, we have put together a wide stock programme of diffusers with very different characteristics and properties.
Almost every application has different requirements and we offer the desired flexibility with our collection. We stock light diffusers in sheets, tubes and round bars.
The rule of thumb for a simple solution with approx. 30% light transmission is that the distance between the light sources (LED strips e.g.) is equal to the distance from the light sources to the diffuser plate.
By placing a diffusing something between the observer and the light source.
Which diffuser to choose in a particular situation is by no means easy to answer, as there are quite a few aspects to consider: type of light source, beam angle, spacing, placement options, desired light output, impact resistance requirements, fire behaviour, indoor or outdoor use, serviceability and how long it will last. It is an area of expertise.
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