| 摘要 |
An LED lighting apparatus connected to a power source via two electric lines, comprises first and second LEDs which have different emission spectrum or chromaticity each other, a switching unit to monitor a length of ON time of power being supplied from the two electric lines periodically to switch a control mode of the first and second LEDs between a first mode and a second mode as a condition that a state that the ON time is not changed continues more than a threshold value, a first control unit to determine, in the first mode, a total amount of an average current to be supplied to the first LED and an average current to be supplied to the second LED depending on the length of the ON time of the electric power, and a second control unit to determine, in the second mode, a ratio of an average current to be supplied to the first LED and an average current to be supplied to the second LED depending on the length of the ON time. |
