Abstract: A device for realizing a cooling effect in a space comprises: a housing with a heat-conducting wall, which housing bounds a chamber through which air can flow; an air inlet which connects to the chamber and to said place, —an air outlet connecting to the chamber; air transport means for transporting air from the air inlet via the chamber to the air outlet; and moistening means for moistening the inner surface of the wall; this such that air supplied by the air transport means is introduced into the chamber via the air inlet, passes along the moistened inner surface of the wall in the chamber and is discharged from the chamber via the air outlet, whereby the water present on the inner surface of the heat-conducting wall evaporates and is entrained by the air flowing by, and the wall is cooled.

Abstract: A device for realizing a cooling effect in a space comprises: a housing with a heat-conducting wall, which housing bounds a chamber through which air can flow; an air inlet which connects to the chamber and to said place, —an air outlet connecting to the chamber; air transport means for transporting air from the air inlet via the chamber to the air outlet; and moistening means for moistening the inner surface of the wall; this such that air supplied by the air transport means is introduced into the chamber via the air inlet, passes along the moistened inner surface of the wall in the chamber and is discharged from the chamber via the air outlet, whereby the water present on the inner surface of the heat-conducting wall evaporates and is entrained by the air flowing by, and the wall is cooled.

Abstract: A display device such as a light box comprises: a housing; a light source accommodated in this housing; and at least one diffusely translucent display face illuminated by the light from this light source. Orienting means are added to the light source so as to obtain a directional characteristic of the light emitted by the light source such that the light source directly illuminates at least one wall almost exclusively. This at least one wall is diffusely reflective such that a part of the light incident thereon is reflected to the display face. This has an almost constant luminance as a result.

Abstract: A display device such as a light box comprises: a housing; a light source accommodated in this housing; and at least one diffusely translucent display face illuminated by the light from this light source. Orienting means are added to the light source so as to obtain a directional characteristic of the light emitted by the light source such that the light source directly illuminates at least one wall almost exclusively. This at least one wall is diffusely reflective such that a part of the light incident thereon is reflected to the display face. This has an almost constant luminance as a result.