Abstract: Disclosed is an artificial window (1) comprising a light box (10) having a rear wall (11) and a planar diffuser arrangement (14) in front of the rear wall (11). The artificial window further comprises at least one first light source (13) extending between the rear wall (11) and the diffuser (14); a window frame (20) in front of the diffuser (14); and drivers (15, 28) arranged for operating the light source (13) and electrically connected to the light source (13). The artificial window also comprises at least one additional light source (25) electrically connected to one of said drivers (28), which additional light source (25) radiates light in substantially one direction and is arranged to radiate light onto a portion of the front side of the diffuser arrangement (14) during operation.

Abstract: Disclosed is an artificial window (1) comprising a light box (10) having a rear wall (11) and a planar diffuser arrangement (14) in front of the rear wall (11). The artificial window further comprises at least one first light source (13) extending between the rear wall (11) and the diffuser (14); a window frame (20) in front of the diffuser (14); and drivers (15, 28) arranged for operating the light source (13) and electrically connected to the light source (13). The artificial window also comprises at least one additional light source (25) electrically connected to one of said drivers (28), which additional light source (25) radiates light in substantially one direction and is arranged to radiate light onto a portion of the front side of the diffuser arrangement (14) during operation.

Abstract: The invention relates to a low-pressure mercury vapor discharge lamp (10) comprising a metal compound which is selected from the group formed by compounds of titanium, zirconium, hafnium and their mixtures. The effect of adding the metal compound selected from said group to the gas filling of the discharge space (14) results in an increased efficiency of the low-pressure gas discharge lamp (10), because part of the emitted light from the discharge space (14) is in the visible range of the electromagnetic spectrum. In one embodiment of the invention, the low-pressure gas discharge lamp (10) produces substantially white light without the use of a luminescent layer (16) comprising a luminescent material. In another embodiment of the invention, the luminescent layer (16) is applied to the discharge vessel (12) of the low-pressure gas discharge lamp (10). The light emitted by the luminescent material can be mixed with the light emitted from the discharge space (14) to produce the required color.

Abstract: The invention relates to an improved low-pressure gas discharge lamp comprising a gas discharge vessel (1) surrounding a discharge space (2), containing a gas filling, and further comprising means to generate an electromagnetic field (3) and means for generating and maintaining a low-pressure gas discharge. The lamp is characterized in that the discharge lamp is provided with a first phosphor coating on a surface of the gas discharge vessel and with a second phosphor coating, the second phosphor coating being provided on a surface of the lamp that is more remote from the discharge space compared to the first phosphor coating, and the first phosphor coating being selected from the group of thermally stable phosphors. The low-pressure discharge lamp provides increased efficiency and reduced solarisation as compared to commercially available low-pressure discharge lamps.

Abstract: An area light source (1) comprising a first light source (2) emitting light (L2) in a first wavelength range, and a light-transparent carrier screen (4) coated with a phosphorous layer (5) is disclosed. The area light source is characterised in that it comprises at least one additional light source (3) projecting light L3 in a second wavelength range, differing from said first wavelength range onto the carrier screen (4), said projected light L3 being capable of exciting the phosphorous layer (5).

Abstract: The invention relates to a discharge lamp (1), comprising: a light-transmissive discharge vessel (2) filled with an ionizable substance, and multiple electrodes (3, 4) connected to said vessel, between which electrodes a discharge extends during lamp operation, wherein at least one electrode is adapted for capacitive coupling of RF electrical energy to said ionizable substance. The invention also relates to a backlight module for backlighting a display device comprising at least one discharge lamp according to the invention. The invention further relates to a display device provided with at least one backlight module according to the invention.

Abstract: The artificial window (1) for use in apartments which lack a window through which day light may enter, has a light box (10) in which three sets of color lamps as light sources (13R,13G,13B) are mounted behind a diffuser (14). A window frame (20) is present in front of the diffuser (14) and a transparent plate (21) in the window frame (20), remote from the diffuser (14). Drivers (15) are present to start, to operate and to dim the light sources (13) thereby allowing to imitate natural light at different seasonal and time conditions. A number of features are described that further enhance the appearance of a real window.