Use of a nonwoven, preferably of a wet-laid nonwoven, as a light diffusion element, where the nonwoven comprises a1) 1-50 wt% of matrix fibres, a2) 50-99 wt% of at least partly thermally fused binding fibres, and b) 20-200 wt% of at least one filling polymer, where the weight fractions of matrix fibres, binding fibres and filling polymer are based in each case on the total weight of the nonwoven without filling polymer, and where - the matrix fibres comprise at least one matrix fibre polymer and the binding fibres comprise at least one binding fibre polymer, - matrix fibre polymer and/or binding fibre polymer independently of one another have a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.3 to 1.7, preferably of 1.5 to 1.65, - the filling polymer has a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.2 to 1.7, - the difference between the refractive index of the matrix fibre polymer and the refractive index of the filling polymer and/or the difference between the refractive index of the binding fibre polymer and the refractive index of the filling polymer is from 0.1 to 0.4, characterized in that the nonwoven has a Gurley number, determined according to ISO 5636 3, > 250 sec/100 ml. a1) 1-50 wt% of matrix fibres, a2) 50-99 wt% of at least partly thermally fused binding fibres, and b) 20-200 wt% of at least one filling polymer, where the weight fractions of matrix fibres, binding fibres and filling polymer are based in each case on the total weight of the nonwoven without filling polymer, and where - the matrix fibres comprise at least one matrix fibre polymer and the binding fibres comprise at least one binding fibre polymer, - matrix fibre polymer and/or binding fibre polymer independently of one another have a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.3 to 1.7, preferably of 1.5 to 1.65, - the filling polymer has a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.2 to 1.7, - the difference between the refractive index of the matrix fibre polymer and the refractive index of the filling polymer and/or the difference between the refractive index of the binding fibre polymer and the refractive index of the filling polymer is from 0.1 to 0.4, characterized in that the nonwoven has a Gurley number, determined according to ISO 5636 3, > 250 sec/100 ml. - the matrix fibres comprise at least one matrix fibre polymer and the binding fibres comprise at least one binding fibre polymer, - matrix fibre polymer and/or binding fibre polymer independently of one another have a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.3 to 1.7, preferably of 1.5 to 1.65, - the filling polymer has a refractive index "n", determined according to DIN EN ISO 489:1999-08, of 1.2 to 1.7, - the difference between the refractive index of the matrix fibre polymer and the refractive index of the filling polymer and/or the difference between the refractive index of the binding fibre polymer and the refractive index of the filling polymer is from 0.1 to 0.4, characterized in that the nonwoven has a Gurley number, determined according to ISO 5636 3, > 250 sec/100 ml.