Patent ID: 8508141

Claim:
A light control apparatus for a white LED light-emitting device, comprising: a driving current supply unit which supplies an AC current as a driving current via a pair of terminals to the white LED light-emitting device including a set of LED elements having mutually different light emission wavelength regions connected in parallel while providing opposite polarities and the pair of terminals provided to supply the driving current to the set of LED elements; an individual amount defining unit which defines a positive driving current amount and a negative driving current amount respectively to be supplied to the white LED light-emitting device in a positive half cycle and a negative half cycle included in one cycle of the AC current respectively; and an operation unit which is provided to impart, to the individual amount defining unit, an operation amount for adjusting the positive driving current amount and the negative driving current amount defined by the individual amount defining unit, wherein the individual amount defining unit includes: a triac which controls supply start and supply stop of positive and negative driving currents, which respectively correspond to the positive and negative driving current amounts, with respect to the white LED light-emitting device; a trigger generating unit which imparts, to the triac, a supply start trigger for the positive driving current and a supply start trigger for the negative driving current; and a time constant circuit which includes a first variable resistor for determining a time constant for allowing the trigger generating unit to generate the supply start trigger for the positive driving current and a second variable resistor for determining a time constant for allowing the trigger generating unit to generate the supply start trigger for the negative driving current; and the operation unit includes a first operation unit for adjusting a resistance value of the first variable resistor and a second operation unit for adjusting a resistance value of the second variable resistor.