| 摘要 |
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%.
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