Patent ID: 8810141

Claim:
An LED illumination system, comprising: a light control apparatus; and an LED illumination apparatus including a first LED and a second LED which have mutually different chromaticities and which are connected in anti-parallel, wherein the light control apparatus is connected to the LED illumination apparatus via only a pair of two wiring lines, and comprises: a DC current generating unit which generates a DC power source from an AC current supplied from an AC power source; a first operation unit which is provided to operate a luminance of an illumination light from the first LED and the second LED; a second operation unit which is provided to operate a chromaticity of the illumination light from the first LED and the second LED; a first control unit which determines a total amount of average currents to be supplied to the first LED and the second LED at every predetermined period depending on an operation amount of the first operation unit; a second control unit which determines a ratio between the average currents to be supplied to the first LED and the second LED respectively at the every predetermined period depending on an operation amount of the second operation unit; and a supply unit which converts the DC current supplied from the DC current generating unit to an AC current including one of positive and negative currents to be supplied to the first LED and the other of the positive and negative currents to be supplied to the second LED as having the total amount of the average currents and the ratio between the average currents determined by the first and second control units at the every predetermined period and which supplies the AC current to the LED illumination apparatus.