Abstract: A white light source (1) comprising an array of at least one blue light source (2), at least one green light source (3), and at least one red light source (4) is disclosed. The blue light source (2) comprises a first light emitting diode (2?) capable of emitting light at a first wavelength. A first wavelength-converting material (2?) is arranged to absorb at least a portion of the light of the first wavelength, and the first wavelength-converting material (2?) is capable of emitting light at a second wavelength, which is at least 500 nm.

Abstract: Low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and a rare gas. The discharge vessel (10) comprises discharge means for maintaining a discharge in the discharge space (13). The discharge vessel is provided with a source of mercury (7). In addition, the discharge vessel is provided with a releasing means (8) for the controlled release of mercury vapor from the source of mercury. The releasing means is operative in response to a condition of the low-pressure mercury vapor discharge lamp, the condition being a characteristic of the discharge lamp and/or a predetermined time interval. The discharge lamp according to the invention operates under unsaturated mercury conditions. Preferably, the releasing means is operated via a switch device, preferably comprising a reed relay.

Abstract: Low-pressure mercury vapor discharge lamp comprises a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and a rame gas. The discharge vessel comprises discharge means (20a; 20b) for maintaining a discharge in the discharge space. The discharge vessel is provided with a container comprising an amalgam (2). The container is provided with releasing means (4) for the controlled release of mercury vapor from the amalgam. The releasing means is open during lamp operation and is substantially closed when, during lamp operation, the temperature of the amalgam becomes higher than a pre-determined temperature. Preferably, the predetermined temperature corresponds to a temperature of a range of temperatures at which the mercury-vapor pressure above the amalgam is relatively stable.