| 摘要 |
PURPOSE:To reduce the weight of a light panel, and transmit light from a lamp effectively to the light panel. CONSTITUTION:In a lighting device in such a constitution as to reflect light from a lamp 1 transmitted through a light panel 2 comprising lamination of plural light conductive plates of different sizes of by a reflection plate, the length of the longer side of the panel 2 is set shorter than a distance B between filaments 4 in the lamp 1, and longer than a distance between portions where light is emitted at 75% brightness of the maximum brightness of the lamp 1. |
