| 摘要 |
The housing (1) has a beam (10) connecting two opposite sides (la) of a frame and disposed close to lighting tubes (3). The beam has a central part (10b) which is parallel to the bottom of the housing constituted by a transparent or translucent panel (9). The beam has two end parts (10a) permitting to separate the central part from the frame and to bring the central part closer to the lighting tubes. |
