Abstract: A fish lighting system has an input interface which receives instructions corresponding to a desired fish behavioral and/or physiological response. This is converted into a lighting control signal for driving a lighting arrangement, with the intensity and color of the output from the lighting arrangement selected to obtain the desired fish behavioral and/or physiological response.

Abstract: A fish lighting system has an input interface (10) which receives instructions corresponding to a desired fish behavioral and/or physiological response (12). This is converted into a lighting control signal (RGB, t) for driving a lighting arrangement (18), with the intensity and color of the output from the lighting arrangement selected to obtain the desired fish behavioral and/or physiological response.

Abstract: A light emitting module (10), adapted to produce white output light having an emission peak in the wavelength range from 400 to 440 nm, comprises: ?—at least one first light emitting element (110) adapted to emit light having an emission peak in a first wavelength range from 440 to 460 nm; ?—at least one wavelength converting material (85) arranged to receive light emitted by said first light emitting element, and being capable of emitting light having an emission peak in the green to red wavelength range; and ?—at least one second light emitting element (120) adapted to emit light having an emission peak in a second wavelength range from 400 to 440 nm. The module according to the invention provides white light of acceptable color rendering with a “crisp white” effect.

Abstract: A fish lighting system has an input interface (10) which receives instructions corresponding to a desired fish behavioral and/or physiological response (12). This is converted into a lighting control signal (RGB, t) for driving a lighting arrangement (18), with the intensity and color of the output from the lighting arrangement selected to obtain the desired fish behavioral and/or physiological response.

Abstract: A light emitting module (10), adapted to produce white output light having an emission peak in the wavelength range from 400 to 440 nm, comprises:•—at least one first light emitting element (110) adapted to emit light having an emission peak in a first wavelength range from 440 to 460 nm;•—at least one wavelength converting material (85) arranged to receive light emitted by said first light emitting element, and being capable of emitting light having an emission peak in the green to red wavelength range; and•—at least one second light emitting element (120) adapted to emit light having an emission peak in a second wavelength range from 400 to 440 nm. The module according to the invention provides white light of acceptable color rendering with a “crisp white” effect.

Abstract: A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The discharge vessel includes electrode(s) for maintaining a discharge in the discharge space. The discharge vessel further includes a dispenser for controllably dispensing hydrogen into the discharge space during lamp operation. The hydrogen gas pressure during lamp operation is in the range between 10?3 Pa and 10 Pa.

Abstract: A low-pressure mercury vapor discharge lamp (1) has a discharge vessel (3) enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The discharge vessel (3) comprises means for maintaining an electric discharge in the discharge space. A portion of the surface (15) of the discharge vessel (3) facing the discharge space is provided with a protective layer (16) comprising yttrium oxide or aluminum oxide and further comprises a borate and/or a phosphate of an alkaline earth metal and/or of scandium, yttrium, or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium, and/or barium. Preferably, the further rare earth metal is lanthanum, cerium, and/or gadolinium. The lamp according to the invention has a comparatively low mercury consumption.

Abstract: The invention provides a lighting device (1) comprising a housing (10) which comprises a light source (13), an emission window (2) for the light, and a semitransparent layer (4; 7, 8; 19, 20, 21); a controllable absorber (18; 22, 23; 25; 30) extending over a substantial portion of the complete optical window (2); and a control unit (15) for controlling the light source (13) and the absorber (18; 22, 23; 25; 30), wherein the absorber is controllable between a first state with an average transmittance of the lighting device (1) with respect to the produced light of at least 50% and a second state with an average transmittance of the lighting device (1) with respect to the produced light of at most 10%.

Abstract: The low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (2) enclosing, in a gastight manner, a discharge space (1) provided with a filling of mercury and a rare gas. The discharge vessel comprises discharge means (8) for maintaining a discharge in the discharge space (1). The discharge vessel comprises dispenser means (20) for controllably dispensing hydrogen into the discharge space. The hydrogen gas pressure is in the range between 10?3 Pa and 10 Pa. Preferably, the hydrogen gas pressure is in the range between 10?2 Pa and 1 Pa. A low-pressure mercury vapor discharge lamp with a good maintenance is obtained.

Abstract: Low-pressure mercury vapor discharge lamp has an at least partly substantially cylindrical discharge vessel (10) with a length Ldv and with an internal diameter Din. The discharge vessel (10) encloses, in a gastight manner, a discharge space (13) provided with a inert gas mixture and with mercury. The discharge vessel (10) comprises discharge means (electrodes 20a; 20b) for maintaining a discharge in the discharge space (13). According to the invention, the ratio of the weight of mercury mHg in the discharge vessel (10) to the product of the internal diameter Din and the length of the discharge vessel Ldv is given by the relation: Formula (I), wherein C?0.01 ?g/mm2. Preferably, 0.0005?C?0.005 ?g/mm2. Preferably, the discharge vessel (10) contains less than 0.1 mg mercury. The discharge lamp according to the invention operates under unsaturated mercury conditions.

Abstract: A low-pressure mercury vapor discharge lamp (1) has a discharge vessel (3) enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The discharge vessel (3) comprises means for maintaining an electric discharge in the discharge space. A portion of the surface (15) of the discharge vessel (3) facing the discharge space is provided with a protective layer (16) comprising yttrium oxide or aluminum oxide and further comprises a borate and/or a phosphate of an alkaline earth metal and/or of scandium, yttrium, or a further rare earth metal. Preferably, the alkaline earth metal is calcium, strontium, and/or barium. Preferably, the further rare earth metal is lanthanum, cerium, and/or gadolinium. The lamp according to the invention has a comparatively low mercury consumption.

Abstract: In a fluorescent lamp mercury consumption is reduced by embedding the luminescent particles making up the luminescent layer in a matrix of aluminum phosphate comprising aluminum oxide particles and covering the embedded luminescent particles with a top coating of e.g. yttrium oxide.