| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus which has useful functions. <P>SOLUTION: When a plurality of light-emitting diodes in a light source section are subject to a limitation on the number of pieces which can be switched on, the power supplied to each diode is increased by making use of an excess capacity of a heat radiation section. When the illumination range is narrowed by a switch-on limitation, the increased power supply to each diode helps to brighten the inside of the illumination range. The plurality of light-emitting diodes are disposed in a three-dimensional layout by placing them on a curved flexible board, whereby directions of irradiation are condensed. The illumination range can be shifted, without the need for a moving unit, by only changing the light-emitting diodes to be switched on. When the light-emitting diodes become dark, their color temperatures are also lowered, thereby simulating the filament emission of an incandescent lamp. A color temperature storage unit is provided. The duty cycles on one or both sides of plural types of light-emitting diodes differing in color temperature are changed as appropriate depending on situation, by which a change of color temperatures is realized. <P>COPYRIGHT: (C)2012,JPO&INPIT |
