LED LIGHTING DEVICE

• Main Authors: TAKEDA RITSU, SHAMOTO TAKESHI, MAKINO KENJI
• Format: Patent
• Language: English
• Published: 09.10.2014
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

PROBLEM TO BE SOLVED: To provide an inexpensive and useful LED lighting device including a semiconductor light-emitting device having three kinds or more of different color temperature, in which the control region of color temperature is relatively wide and a natural change in color temperature can be achieved along the black body radiation, and desired chromaticity adjustment becomes possible by a simple method without requiring complex control.SOLUTION: An LED lighting device includes a first LED emitting white light of a predetermined first color temperature, a second LED emitting white light of a second color temperature higher than the first color temperature, and a third LED emitting white light of a third color temperature higher than the first color temperature but lower than the second color temperature. The LED lighting device further includes a toning control unit for controlling only the first LED and third LED when toning the color temperature between the first color temperature and third color temperature, and controlling only the third LED and second LED when toning the color temperature between the third color temperature and second color temperature.