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Fost Large Bulb PET Felt Acoustic Lamp Designed by De Vorm


With its impressive volume and graphic design, Fost Large Bulb brings elegance and functionality to any space. Made of PET Felt material, the lamp dampens the sounds providing acoustic comfort underneath it. Available in a vibrant colour palette and equipped with a universal fitting, Fost Large Bulb adds versatility to your lighting choices. 

Impressive volume

Fost Large Bulb stands out in any room with its ambient 118 cm lampshade. Thanks to such impressive volume and soft, sound-absorbing material, it effectively dampens the noises. Apply Fost Large Bulb above meeting or dining tables to improve acoustics locally, or combine multiple lamps to tackle the needs of large open-plan interiors. 

Fost series

Fost series offers a diverse range of options, integrating effortlessly into any environment. 

Play with the colours

Fost Large Bulb is available in 11 PET Felt blends, adding a vibrant touch to any workspace, meeting or dining area.

PET Felt colour blends


Fost Large Bulb in projects 

We are always curious to see how our products work in completed interiors. Have you applied or seen Fost in any project? We’d love to hear from you

PET Felt Technology

The lampshade of the Fost lamp is made of PET Felt - a sustainable and durable material manufactured from recycled plastic bottles. This technology brings many production steps down to a single moulding action, allowing to press a plain sheet of felt into any imaginable form.

With Fost, we have created a unique ribbed pattern on the lampshade, dictating its bold visual identity. This unique shape also adds sturdiness to the lamp and creates substantial volume, much needed for an acoustic lamp. 



  • Shell
    PET Felt
  • Inner plate
    Powder-coated steel
  • Fixture
    Steel cables + ceiling mount, 3 m
  • Electrical cord
    3-way, 3 m

Technical details

  • Weight
    8.8 kg
  • Fitting
    E26/27 (light bulb not included)

Installation guide

  • Find the installation guidelines here


  • Shell
    Yellow, Pink, Marine, Turquoise, Dark Green, Green, Dark Grey, Olive, Beige, Light Grey, Brown*

    *Due to the recycled content of the PET felt, minor colour differences may occur. 
  • Inner plate 
    White (RAL 9010)
  • Electrical cord

Care & Maintenance

Hi-Res images


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