PROBLEM TO BE SOLVED: To provide a luminaire using LED that can be directly driven with AC and/or DC input, acquires stable light emission, realizes low power consumption, and additionally has a function as an emergency lamp, a driving circuit for a luminaire using LED, and a method of driving a luminaire using LED.SOLUTION: A voltage between the zero-level potential and the peak of a pulsed voltage or a specific voltage lower than the peak in the neighborhood of the peak is divided into plural slice levels, the number of selections is increased or decreased for each slice level synchronously with the variation timing of the pulsated voltage, whereby it is possible to perform direct driving with AC and/or DC input with a simple configuration, stable light emission which solves problems of flicker and dark time is obtained, a smoothing capacitor after rectification and a large capacity electrolytic capacitor became unnecessary, so that the number of components can be reduced, manufacturing can be performed at low cost, long-term reliability is enhanced, the problem of high frequency noise can be eliminated, power factor (performance factor) can be improved by a highly efficient operation, and low power consumption can be realized.SELECTED DRAWING: Figure 1
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