Patent ID: 8742696

Claim:
An illuminating apparatus, adapted to receive an input power which is a pulse DC, comprising: a lighting unit, having a plurality of lighting sets and a switching unit for interconnecting the lighting sets in a serial manner or in a parallel manner, wherein each one of the lighting set comprises a plurality of serial-connected LEDs; a detecting unit, for detecting a state for the input power inputted to the lighting unit; and a controlling unit, coupled to the detecting unit and the switching unit, for controlling the switching unit according to the detecting unit detecting the state of the input power in order to adjust a turn-on voltage of the lighting unit according to the input power; wherein the controlling unit receives time period information of the input power indicative of a time period of the input power via the detecting unit, and sets up a plurality of predetermined time values within the time period, each of which corresponds to the state of the input power, and the controlling unit causes the switching unit to operate when the predetermined time values have been reached.