Patent ID: 8847504
Filing Date: 2014-09-30
Classification: H05B,Y02B

Abstract:
1. A lighting device to which phase controlled AC electric power is supplied, the lighting device comprising: a rectifying/smoothing circuit that rectifies and soothes the AC electric power; a light-emitting array including a plurality of light-emitting elements that are grouped into two or more sets, each set having one of different lighting colors, the sets being inserted in series to a wiring having two ends in an order of the color temperatures of the lighting colors, one end of the wiring being connected to a positive terminal of the rectifying/smoothing circuit, a plurality of nodes positioned between each pair of sets inserted between the one end and the other end of the wiring, each node being connected, via a respective switch element, to a negative terminal of the rectifying/smoothing circuit; and a switching unit that turns on one of the switch elements in accordance with a voltage level of the phase controlled AC electric power wherein as the voltage is higher, the one of the switch elements that is turned on is on a more distant node from the one end of the wirings.