Acoustically absorbent lighting module
A lighting module ( 10 ) is disclosed comprising a housing ( 15 ) and a woven fabric ( 50 ) defining a light exit window across said housing, the housing comprising an acoustically absorbent panel ( 20 ) opposing the woven fabric and a light engine arrangement ( 30 ) on the acoustically absorbent panel arranged to generate a light output through the light exit window, the lighting module further comprising a felt-based volumetric diffuser ( 40 ) in between the woven fabric and the light engine arrangement. Also disclosed are a N lighting kit and luminaire comprising such lighting modules ( 10 ).
1. A lighting module comprising a housing and a woven fabric defining a light exit window across said housing, the housing comprising an acoustically absorbent panel opposing the woven fabric and a light engine arrangement in between the acoustically absorbent panel and the woven fabric, and arranged to emit light in a direction towards the woven fabric, the lighting module further comprising a felt-based volumetric diffuser in between the woven fabric and the light engine arrangement, wherein the woven fabric comprises openings with a diameter in a range of 20-500 micrometers, wherein the felt-based volumetric diffuser is composed of non-woven fibres having a diameter in a range of 5-200 micrometers, and wherein the fibres have diameters that are smaller than a minimum diameter of the openings.
2. The lighting module of claim 1 , wherein the felt-based volumetric diffuser has a constant optical density.
3. The lighting module of claim 1 , wherein the felt-based volumetric diffuser has a thickness in a range of 2-10 mm.
4. The lighting module of claim 1 , wherein the felt-based volumetric diffuser is composed of plastic, glass or quartz-based fibres.
5. The lighting module of claim 1 , wherein the felt-based volumetric diffuser is composed of fibres that are bonded by an optically transmissive binder.
6. The lighting module of claim 1 , wherein the felt-based volumetric diffuser is attached to the woven fabric or is integral to the woven fabric.
7. The lighting module of claim 6 , further comprising a mesh attached to the woven fabric, said mesh retaining the felt-based volumetric diffuser against the woven fabric.
8. The lighting module of claim 1 , wherein the felt-based volumetric diffuser is suspended in a frame mounted in between the woven fabric and the acoustically absorbent panel.
9. A lighting kit comprising a plurality of lighting modules of claim 1 , wherein the lighting modules are configured to be coupled to each other.
10. A luminaire comprising at least one lighting module of claim 1 .