Diffuseurs de Lumière Volumétriques

Numéro de référence fabricant :


Fabricant Luminit


Description :

Les diffuseurs de lumière VLSD de Luminit sont basés sur une nouvelle technologie de diffusion volumétrique. Les diffuseurs holographiques standards de Luminit (LSD) reposent sur une micro-structure en relief de surface qui diffracte le faisceau pour fournir un contrôle précis de l’angle du faisceau.

Le nouveau produit VLSD intègre des particules de diffusion dans le volume ou la masse du substrat. Le diffuseur LSD volumétrique est un diffuseur rigide de haute qualité en PMMA (acrylique) de 2mm d’épaisseur et fournit une efficacité de transmission élevée de 82 % et d’excellente puissance.

Les diffuseurs de lumière volumétriques sont conçu pour une utilisation dans tous les types de luminaires de plafond, y compris des lumières encastrées vers le bas jusqu'à 8 pieds de long, troffers et des éclairages suspendus.

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    • Matériau: Acrylique PMMA
    • indice de réfraction: 1.49
    • Angle de diffusion: 5° à 100°
    • Transmission: 75% jusqu'à 92%
    • Gamme de température de -30°C à 80°C
    • Dimensions: Epaisseur 2mm , 8 inch de long


    • Applications: Luminaires, Linear recessed fixtures, Eclairage LED sur panneaux, luminaires vers le bas, Linear fixtures, Elcairages suspendus et arrières
    • Facilité de Thermoformage
    • Résiste aux impacts
    • Stable aux UV

    Eclairage en vue directe homogénéisation sur le diffuseur lui-même

    Les différents formats des diffuseurs

    Généralités sur les diffuseurs de lumière Luminit

    Les différents angles de diffusions

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Lisez nos FAQs ci-dessous et soumettez-nous les vôtres

    What are Light Shaping Diffusers?

    Light Shaping Diffusers are a micro-structures pseudo randomly embedded on a substrate (such as film). When applied to a lighting structure, the Light Shaping Diffuser can manipulate light by changing the direction of its energy, allowing it to clean up and shape a light beam to suit a particular purpose.

    Expert: Cécile Mercusot

    Where are LSDs used?

    LSDs are often applied in architectural lighting, can lights, decorative lighting, pool lighting, set/event lighting and wall wash lighting where the effects of LSDs can be quite dramatic. LSDs are also used in illumination systems such as aircraft inspection lights

    Expert: Cécile Mercusot

    What sizes of LSDs are available?

    Thin film LSDs are available in rolls, sheets or parts cut to your specifications. Standard rolls are 508mm wide and 150m long. Strip rolls are also available in your specified width.

    Expert: Cécile Mercusot

    Are LSDs available for smaller applications?

    Yes, Luminit LSDs are available in various circular and elliptical angles in pre-cut sheet format for lower volume applications.

    Expert: Cécile Mercusot

    What angles are available?

    LSDs are available in a variety of circular and elliptical angles from 1° to 80° on thin film or rigid substrates.

    Expert: Cécile Mercusot

    What is the transmission efficiency of Luminit LSDs?

    The transmission efficiencies of Luminit LSDs are rated between 85-92% (depending on the angle). This very high efficiency rating is due to the fact that the technology is based on diffractive microstructures. Smaller angle diffusers have the highest transmission.

    Expert: Cécile Mercusot

    Is the angle of diffusion and transmission wavelength dependent?

    Since the microstructures are random and non-periodic, the LSD is not wavelength dependent, so it works well from 400nm to 1500nm.

    Expert: Cécile Mercusot

    Can LSDs reduce hotspots with LED lights?

    Yes, Luminit LSDs eliminate the hotspots without a significant reduction in the amount of the light, provided that the diffuser is placed a sufficient distance from the LEDs. A rule of thumb is that the diffuser must be at least as far away from the LEDs as the LEDs are spaced apart.

    Expert: Cécile Mercusot

    Can LSDs shape light beams?

    Yes, Luminit LSD are so precise that beam shaping is possible. A patented holographic master recording process allows a variety of circular and elliptical light patterns. Standard circular angles range from 0.5° to 80° FWHM. A wide variety of standard elliptical angles, ranging from 10° x 0.2° to 95° x 35°, are available.

    Expert: Cécile Mercusot

    What does FWHM mean?

    FWHM is an abbreviation for Full-Width Half-Maximum, which is the angle of diffusion that would be seen after a collimated laser passes through the diffuser.

    Expert: Cécile Mercusot

    How long does an LSD last?

    For indoor applications, an LSD would last as long as the light structure. For outdoor applications, measures may need to be taken to prevent a yellowing of the film due to exposure to the sun. For outdoor lighting applications, Luminit offers an optional UV-stable substrate to help prevent yellowing.

    Expert: Cécile Mercusot

    Should I face the diffuser towards or away from the light source?

    The diffuser has improved transmission characteristics if the microstructure side is facing the light source, but it has better source hiding characteristics if the microstructure side is facing away from the light source.

    Expert: Cécile Mercusot

    How should I handle the diffuser and can I clean it if it gets dirty?

    Handle the diffuser with clean latex gloves. High angle diffusers are very prone to damage due the height of the microstructures. They can be cleaned carefully using optical wipes and ethanol using the industry-standard "drop and drag" technique.

    Expert: Cécile Mercusot

    How do I mount the diffuser in my system?

    We recommend you find a mechanical means of securing the diffuser into your system, for example using the natural tension of a film on curved surface. Luminit offer pressure sensitive adhesive (PSA) as an option but this process is difficult and you may experience the incorporation of air bubbles during the lamination process.

    Expert: Cécile Mercusot

    Does the LSD’s angle of diffusion or transmission change if I use a thicker LSD diffuser?

    No, since the technology is based on a surface relief pattern, these parameters are not dependent on the thickness of the substrate. However, there are inherently additional transmission losses if very thick substrates are utilised (Beer’s Law).

    Expert: Cécile Mercusot

    What is the effective working distance of the diffuser to eliminate hotspots under direct view?

    This depends on the angle of divergence and spacing of the light sources. With 110° Field of View, surface mount LEDs, the relationship is around 1:1. That is, if the LEDs are spaced 1 inch apart then you will need a little more than 1 inch distance from the LEDs to our largest diffuser angles.

    Expert: Cécile Mercusot

    How can I determine which angle will work for me?

    We can offer a sample page with 9 samples about 1 inch square as well as larger A4 sized sheets of select single angles on 0.010 inch thick polycarbonate. Contact us for more information.

    Expert: Cécile Mercusot

    Can the LSD diffuser replace a secondary optic?

    No, an LSD cannot decrease the divergence of a light source, it can only increase its angle of divergence.

    Expert: Cécile Mercusot

    What is a DTF?

    Luminit’s DTF (Direction Turning Film) is a non-symmetrical linear micro-prismatic that imparts a 20° shift in the angle of a semi-collimated light source. The DTF works well with LED light sources that utilise secondary optics. Some applications include recessed can lights to allow for more wall washing, pathway/stair lighting to reduce glare and increase ground illumination, and pool lighting to increase illumination of the bottom.

    Expert: Cécile Mercusot

    How do DTFs work with LSDs?

    Direction Turning Films can be combined with Light Shaping Diffusers to shape and homogenize the beam in addition to changing the direction. The beam can be shaped in a circular or elliptical pattern dependent on the diffuser angle chosen. These light bending films enable off-axis placement of the incoming beam when direct line of sight is impractical. Applications include LED lighting, avionics displays, traffic signs/displays and LCD backlights. They are also used to change the light beam direction to light a wall, walkway or other lighting target.

    Expert: Cécile Mercusot

    Can we model the diffuser in optical software?

    Yes, we can provide BTDF data. Contact us for more information.

    Expert: Cécile Mercusot

    How linear is the transmission and diffusion angle with drive signal?

    The diffusivity has a natural "sigmoidal" (ie "S" curve) response to drive signal strength.

    Expert: Cécile Mercusot

    What angles of diffusion can I achieve?

    You can achieve a range of angles from 1° FWHM in the clear state to 70° FWHM in the fully diffused state.

    Expert: Cécile Mercusot

    What is the transmission of the EVD-M?

    The EVD unit has an 81% transmission efficiency in the "on" state and 78% in the "off" state measured at 550nm at 28°C. Anti-reflection coated glass laminates are available on a special order basis to improve transmission.

    Expert: Cécile Mercusot

    What can I do with an Electronically Variable Diffuser?

    The EVD unit is useful in dynamically and precisely adjusting the beam divergence of a collimated or semi-collimated light source. Typical applications include bio-photonics and bio-chemical research, neutral density filtering, detector sensitivity control, and optical characterisation of materials.

    Expert: Cécile Mercusot

    How is the EVD-M powered?

    The EVD-M is powered by a RoHS compliant wall transformer that accepts 100 to 240 volts AC and transforms it to 9 volts DC for the EVD-M. It uses up to 100mA of current at 9 volts.

    Expert: Cécile Mercusot

    Over what temperature range can EVDs operate?

    EVDs can operate at temperatures from 10°C to 55°C.

    Expert: Cécile Mercusot

    How do I clean the EVM-M?

    The special liquid crystal in the aperture of the EVD-M can be cleaned with a conventional compressed gas spray duster. Oils and other more adherent contaminants can be removed with the "drop and drag" cleaning technique using an isopropyl alcohol moistened optical lens tissue.

    Expert: Cécile Mercusot

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