Abstract: Disclosed is a luminaire having a light exit window (30) for emitting light from the luminaire, and a reflective screen (40) arranged opposite the light exit window. The luminaire further includes a light source (20) which is arranged for indirect illumination of the light exit window via the reflective screen. The light source is arranged near the light exit window on an imaginary plane P substantially parallel to the light exit window and emits light away from the light exit window. The luminaire further includes a specularly reflective part (43) as part of the reflective screen, which specularly reflective part is concavely shaped for reflecting at least part of the light emitted by the light source towards a diffusely reflective part (42) of the reflective screen.

Abstract: Disclosed is a luminaire having a light exit window (30) for emitting light from the luminaire, and a reflective screen (40) arranged opposite the light exit window. The luminaire further includes a light source (20) which is arranged for indirect illumination of the light exit window via the reflective screen. The light source is arranged near the light exit window on an imaginary plane P substantially parallel to the light exit window and emits light away from the light exit window. The luminaire further includes a specularly reflective part (43) as part of the reflective screen, which specularly reflective part is concavely shaped for reflecting at least part of the light emitted by the light source towards a diffusely reflective part (42) of the reflective screen.

Abstract: The invention relates to a luminaire (2) and an illumination system (12). The luminaire according to the invention comprises a light exit window (30) for emitting light from the luminaire, and a reflective screen (40) arranged opposite the light exit window. The luminaire further comprises a light source (20) which is arranged for indirect illumination of the light exit window via the reflective screen. The light source is arranged near the light exit window on an imaginary plane P substantially parallel to the light exit window and emits light away from the light exit window. The luminaire further comprises a specularly reflective part (43) as part of the reflective screen, which specularly reflective part is concavely shaped for reflecting at least part of the light emitted by the light source towards a diffusely reflective part (42) of the reflective screen.

Abstract: The illumination system includes a light source, a diffusing element and a specular back reflector. The light source is configured to emit light towards the specular back reflector reflecting at least part of the light emitted by the light source so as to illuminate the diffusing element. The specular back reflector is shaped to generate a substantially homogeneous distribution across the diffusing element of a light flux impinging on the diffusing element.

Abstract: A light-emitting device comprises a light source adapted to emit light of a first wavelength range; a reflective body comprising a reflective layer; a wavelength converting layer comprising a wavelength converting material adapted to absorb light of said first wavelength range and to emit light of a second wavelength range, said wavelength converting layer and said light source being arranged mutually spaced apart; and light-scattering elements adapted to scatter light of at least said first wavelength range; wherein at least part of said light-scattering elements are arranged in the path of light from said light source to said wavelength converting layer. The light-emitting device according to the invention provides improved uniformity in color and also improved brightness uniformity.

Abstract: The invention relates to a luminaire (2) and an illumination system (12). The luminaire according to the invention comprises a light exit window (30) for emitting light from the luminaire, and a reflective screen (40) arranged opposite the light exit window. The luminaire further comprises a light source (20) which is arranged for indirect illumination of the light exit window via the reflective screen. The light source is arranged near the light exit window on an imaginary plane P substantially parallel to the light exit window and emits light away from the light exit window. The luminaire further comprises a specularly reflective part (43) as part of the reflective screen, which specularly reflective part is concavely shaped for reflecting at least part of the light emitted by the light source towards a diffusely reflective part (42) of the reflective screen.

Abstract: There is provided a light-emitting device (1) comprising a light source comprising a plurality of light-emitting diodes (3), said light source having a light outcoupling surface (2); a base (4); an envelope (5) covering said light source, said envelope having a maximum diameter 2*R in a direction transversal to an imaginary axis extending. through said base and said envelope, around which imaginary axis said envelope is symmetrical; and a light scattering material (6) provided in the path of light from said light outcoupling surface; wherein said light outcoupling surface is located at a position at which said envelope has a diameter D in a direction transversal to said imaginary axis, and within a distance r from said imaginary axis, r is less or equal to D/4. The light emitting device provides high efficiency in terms of light flux in the forward direction in relation to the total flux from the light source.

Abstract: A light-emitting device comprises a light source adapted to emit light of a first wavelength range; a reflective body comprising a reflective layer; a wavelength converting layer comprising a wavelength converting material adapted to absorb light of said first wavelength range and to emit light of a second wavelength range, said wavelength converting layer and said light source being arranged mutually spaced apart; and light-scattering elements adapted to scatter light of at least said first wavelength range; wherein at least part of said light-scattering elements are arranged in the path of light from said light source to said wavelength converting layer. The light-emitting device according to the invention provides improved uniformity in colour and also improved brightness uniformity.

Abstract: The invention relates to an illumination system (10), a luminaire (10), a backlighting system and a display device. The illumination system according to the invention comprises a light source (20), a diffusing element (30) and a specular back reflector (40). The light source is configured to emit light towards the specular back reflector reflecting at least part of the light emitted by the light source so as to illuminate the diffusing element. The specular back reflector has a shape which generates a substantially homogeneous distribution across the diffusing element of a light flux impinging on the diffusing element. The illumination system according to the invention has the effect that it generates a uniform distribution of the light across the diffusing element while generating a predictable angular distribution of the emitted light.