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    Glare protection fabrics

    Division Name:  Hunter Douglas Serbia, Montenegro


    • Web:  www.hunterdouglas.co.rs
    • Address: Izletnicki Put 4A
        Novi Beograd 11070
        SRBIJA

    • Phone Number:  +381 (0)11 2608538
    • Fax:  +381 (0)11 2608538
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    •   Roller Blind Fabrics
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    •   Single Skin
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    •   Textile
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    •   Heartfelt® Panels
    •   HeartFelt Groove
    •   HeartFelt® Modular Felt Ceiling System
    •   HeartFelt® MultiPanel
    •   HeartFelt® Origami
    •   HeartFelt® Origami Weave
    •   Heartfelt® Origami Curve
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    •   Interior Metal Ceilings
    •   Interior Metal Linear Closed Ceilings
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    •   Sedes
    •   OPEN CEILING V100/V200
    •   Luxalon® XLts ceiling panels
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    •   Curved Carrier
    •   COMBI-LINE
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    •   Linear Wood Ceiling
    •   Solid Wood Linear Ceilings
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    •   Metal Woodprint Interior Ceilings
    •   Wood Grill Ceiling
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    •   Pareaulux Veneered Wood
    •   Tiles & Panels
    •   Veneered Wood Tiles & Panels
    •   Combi Line
    •   Exterior Metal Ceilings
    •   Exterior Linear Closed Ceilings
    •   Exterior linear closed 75C / 150C / 225C
    •   84C Exterior Linear Closed ceiling
    •   150F / 200F
    •   Linear Open
    •   70U linear open ceiling system
    •   The 80B/84B Linear Open Ceiling System
    •   The 84R linear open ceiling system
    •   Open Ceilings
    •   V100 screen ceiling system
    •   Wide Panel
    •   300C/ 300L exterior wide ceilings panels
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    •   HeartFelt® Walls
    •   HeartFelt® Linear Wall
    •   Wood Walls
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    •   Linear Solid Wood Wall
    •   Linear Veneered Wood
    •   Grill Walls
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    •   Roller Blind Fabrics
    •   Glare protection fabrics
    •   View through fabrics
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    •   Energy savings fabrics
    •   Black out fabrics
    •   Green fabrics
    •   Roller Blind Hardware
    •   Roller blind EOS®500
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    •   External Roller Blinds
    •   Proscreen | External Roller Blind
    •   Ultimate screen zip | External Roller Blind
    •   Sun Louvres
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    GLARE CONTROL FABRICS

    The prevention of glare is one of the most important functions of an internal shading solution. Clearly, glare can have a major impact on our ability to work with a computer screen in the office or read digital boards in a class room. When occupants experience glare, their ability to do their job plummets dramatically.Glare control is best achieved by roller blind fabrics having an openness of less than 5% and consist of opaque yarns or are metallised on one side. Read below why.

    Glare – A manageable annoyance

    What is glare?

    Glare can occur when the amount of light on the eye is too high or when there are contrasts in the field of view that are too extreme. Often, both situations occur simultaneously. In an office, this can easily happen when there’s direct sun on the façade. Research showed that the total amount of light at the eye (illuminance or lux-value) is the strongest predictor of glare. If this value exceeds 3000 lux, most office workers will experience severe glare.

    How to control glare

    Clearly, glare can be controlled by reducing the amount of light entering through the windows. The effectiveness of doing this depends on how much of this reduced light flow is directly transmitted and how much is diffusely transmitted. Ultimate glare control is achieved by black out fabrics. In most cases, this is not the level of control needed.

    EN 14501

    The European norm EN 14501 gives a practical framework for quantifying glare control. In EN 14501, the ability to control glare is classified on a scale of 0 to 4, where 0 indicates very little effect and 4 indicates a very good effect.

    In general, we recommend fabrics having glare control class 2 or 3. These are fabrics that have an openness of less than 5% and do not allow more than 4% of the light to pass through the yarns. These fabrics will provide adequate glare control for occupants viewing parallel to the window.


    Best fabrics to control glare


      BO XL  -  All colours
    BX Xl Fabric
      Imagine BO  -  All colours
    Imagine BO
      Screen Nature  -  Grey | Charcoal
    Imagine BO
      Screen Nature Ultimetal  -  All colours
    Imagine BO
      Panama Chrome  -  All colours
    Imagine BO
      Panama Pro 3% OF  -  Black-Pearl | Black-Grey | Black
    Screen Nature
     

    GreenScreen Eco Chrome 3% OF  -  Pewter | Charcoal

    Screen Nature
      Star 1% OF and 3% OF  -  Gold | Dusk
    Screen Nature
      Serge 1% OF and 3% OF  -  Grey-White | Grey-Sand | Grey | Grey-Black | Black
      Screen Nature


    The fish eye photographs below show the effectiveness of a screen fabric in controlling glare.


    Without Screen Fabric


    A situation of extreme glare. Vertical illuminance at the eye is 42 000 lux. It is impossible to see anything on the computer display.

    With Screen Fabric

    Glare is successfully harnessed by means of a 3% openness metallised screen. Vertical illuminance at the eye is reduced to 2600 lux. Now it is possible to read the computer display

    Luminance

    False color luminance image of the above situation. Luminance of the specular reflection at the desk on the left is approximately 80 000 cd/m2. The contrast ratio of this reflection to the computer display exceeds 400.

    Luminance

    False color luminance image of the above situation. Luminance of the specular reflection on the left is reduced to approximately 2200 cd/m2. The contrast ratio of this reflection to the computer display is reduced to about 10.

     


    EN 14501


    The European norm EN 14501 provides a very practical framework that relates direct and diffuse transmittance of screen fabrics to their ability to control glare.


    ss



    Direct transmittance occurs through the holes in the fabric and determines how much solar radiation goes directly through the screen. The well-known openness factor is a proxy for the direct transmittance.


    Diffuse transmittance is transmittance through the yarns of the fabric. The diffuse transmittance determines the brightness of the screen itself when illuminated from the outside. When too high, the screen itself may become a source of brightness and glare - as in the picture below.

     

    ss

    Example of a shading fabric with an openness factor of 1% and a diffuse transmittance of 43%.
    When directly lit by the sun, the screen becomes a bright source of light of about 7000 cd/m2, more than 20 to 30 times brighter than a computer screen.

     

    The EN 14501 glare control classes are most easily represented in a two dimensional graph of direct and diffuse transmittance. A particular fabric is represented by a point in this plane. The ability to control glare is classified on a scale of 0 to 4, where 0 indicates very little effect and 4 indicates a very good effect.



    ss



    "Good effect" is achieved by fabrics having direct transmittance less than 5% and diffuse transmittance below 2% (Glare control class 3). Only fabrics with no direct transmittance (no openness and view through) and a diffuse transmittance less than 2% achieve a glare rating of 4 – "very good effect." These are black-out or very dark dim-out fabrics. Except for presentation rooms, this is normally not the sort of light control that is needed in an office.
     

    Fabrics attaining a glare 3 rating will either have dark yarns or be metalized. Only these characteristics can guarantee less than 2% diffuse transmittance.


    View direction matters a lot. In offices and class rooms the view direction of occupants is ideally parallel to the window. If an occupant directly faces a window with the sun in the central field of view, glare protection using class 2 or 3 fabrics will generally not be adequate.


    ss



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