| 摘要 |
A lighting apparatus capable of dimming lighting units (10) each using a discharge lamp (20) in various ways. Each lighting unit (10) includes a metal halide lamp (20) and two spaced shutters (28, 29) arranged in front of the lamp (20) on the optical path of the lamp (20). A shutter driver (30) selectively opens or closes the shutters (28, 29) for physically dimming light issuing from the lamp (20). Six lighting units (10) are cascaded in a single group. Ballast boxes (14) each are assigned to a particular lighting unit (10) and include a power supply section (38) for feeding electric power to the lamp (20) and a shutter controller (34) for controlling a shutter driver (30). These structural elements are collectively controlled from a keyboard (12) via a single control box (16). A command generation (64) included in the control box (16) transforms a command input on the keyboard (12) to a command for controlling the individual lighting unit (10). A selector (60) also included in the control box (16) distributes the command to five groups of lighting units (10). The apparatus allows the power supply and dimming of the individual lighting unit (10) to be controlled via the keyboard (12). <IMAGE> |
