| 摘要 |
A flat lighting device (1) has an optical conductor plate (2) and at least two electric light sources (3, 4) which are suitable for coupling light into an optical conductor plate (2) during operation. A first light source (3) is arranged adjacent to the optical conductor plate (2), and a second light source (4) is arranged downstream of the first light source (3) with reference to the optical conductor plate (2) in such a way that at least a portion of the light emitted by the second light source (4) during operation can pass through the first light source (3) into the optical conductor plate (2). In dimmed operation, the first light source (3), which is closest to the optical conductor plate (2), is switched off and reduces the light flux to be coupled into the optical conductor plate (2) from the second light source (4). Extreme dimming is also possible in this way without there being a change in the electric and/or lighting properties of the light source. |
