Abstract: An apparatus includes a first holder configured to hold a light source and having an interface for receiving power to feed to said light source, 1 and a light guide plate configured to be coupled to said first holder and guide light emitted by the light source out from at least one surface of the light guide plate.

Abstract: A method of generating a measuring signal indicating arc straightness in a gas discharge lamp (L) comprises the following steps: in a first step, applying a first lamp current (IN) to the lamp; in a second step, adding a brief pulse current (Ip) to the first lamp current (IN), allowing the lamp voltage to regain a steady state, and measuring the resulting average value of the lamp voltage (V2) in this steady state; generating a measuring signal indicating arc straightness on the basis of said average lamp voltage (V2) measured in the second step.

Abstract: This invention relates to an apparatus for separating space, which can be used as a blade of a window blind, a room divider and a workspace divider etc. The apparatus (100) for separating space comprises a first holder (101), configured to hold a light source (103) and comprising an interface (1011) for receiving power to feed to said light source (103); and a light guide plate (102), configured to be coupled to said first holder (101) and guide light emitted by said light source (103) out from at least one surface (1021/1022) of said light guide plate 102. By applying the apparatus (100) of the present invention, the power source and the light source are separated. The light source (103) is integrated into the apparatus (100) and the power can be easily fed to the light source via the interface (1011) of the first holder (101).

Abstract: A method and a system for controlling at least one lighting arrangement (2), in which the lighting arrangement modulates the light (6, 16, 18) it emits by lighting arrangement data, which contains an identification code identifying the lighting arrangement, a user control device (12) is suitable to receive the light from the lighting arrangement and to derive therefrom the lighting arrangement data, the user control device measures a property of the received light, apart from it representing data, to provide additional data which is associated with the lighting arrangement which is associated with the identification code contained in the received data, the user control device transmits the lighting arrangement data and the additional data, and a main control device (10) is suitable to receive the data transmitted by the user control device and to therewith control the operation of the lighting arrangement.

Abstract: A portable illumination device, for illuminating an object through a medium having an absorption coefficient, has a lighting unit including at least two differently colored light sources for emitting light having a color distribution and a control unit for adjusting the color distribution. The control unit is adapted to receive a distance estimate corresponding to the distance between the illumination device and the object, and adjust the color distribution depending on the distance estimate, such that light reflected from the object is perceived to have substantially correct color reproduction.

Abstract: A driver (10) for driving a gas discharge lamp (L) comprises a current generator (1; 2) for generating a lamp current with a main lamp current component and, for arc-straightening purposes, a ripple current component. A controller (3) controls the current generator such as to set the ripple frequency (fR) and ripple amplitude (M). A memory (5) contains data defining a set point (SP) for the ripple frequency and ripple amplitude. A measuring device (4) provides at least one measuring signal indicative of arc curvature and arc stability. The controller is capable of operating in a ripple optimization mode in which the controller makes small adjustments to the ripple frequency and ripple amplitude to find improved arc-straightening, and, if such improvement is found, controls the current generator on the basis of the adjusted set point or otherwise resumes operation on the basis of the original set point (SP) in the memory (5).

Abstract: The invention relates to a high-pressure discharge lamp intended for use in assimilation lighting. According to the invention, the high-pressure discharge lamp has a discharge vessel with a long axis, enclosing a volume V wherein an ionizable filling comprising a buffer gas and an excess amount of a metal halide, which is selected from LiI, NaI and CaI2, is present, the discharge vessel having an inflated shape wherein at least the ends are non-cylindrical and curved towards the long axis at both ends, with an inner wall area A for which it holds that A/V<6.6.

Abstract: The present invention relates to a portable illumination device (100) for illuminating an object (200) through a medium having an absorption coefficient, the illumination device (100) comprising a lighting unit (101) including at least two differently colored light sources (Li-L3) for emitting light having a color distribution, and a control unit (105) for adjusting the color distribution. The control unit (105) is adapted to receive a distance estimate corresponding to the distance between the illumination device (100) and the object (200), and adjust the color distribution depending on the distance estimate, such that light reflected from the object is perceived to have substantially correct color reproduction. An advantage with the invention is that an object (200) illuminated through a medium will be perceived by a user using the portable illumination device (100) as having a substantially correct color reproduction.

Abstract: A method and a system for controlling at least one lighting arrangement (2), in which the lighting arrangement modulates the light (6, 16, 18) it emits by lighting arrangement data, which contains an identification code identifying the lighting arrangement, a user control device (12) is suitable to receive the light from the lighting arrangement and to derive therefrom the lighting arrangement data, the user control device measures a property of the received light, apart from it representing data, to provide additional data which is associated with the lighting arrangement which is associated with the identification code contained in the received data, the user control device transmits the lighting arrangement data and the additional data, and a main control device (10) is suitable to receive the data transmitted by the user control device and to therewith control the operation of the lighting arrangement.