A device for emitting white-color light comprising: (i) a light emitting diode including: an LED chip comprising a gallium nitride compound semiconductor containing indium and being capable of emitting a blue color light, and a phosphor capable of absorbing a part of the blue color light and emitting a light having longer wavelength than the blue color light, the blue color light and the light from said phosphor being mixed to make the white-color, (ii) a control unit for converting an input to pulse signals, (iii) a driver receiving said pulse signals from said control unit to drive said LED chip, wherein the brightness of the white-color light from said light emitting diode is controlled by a width of said pulse signals. view more

The device according to claim 1, wherein said phosphor has a garnet structure and is activated with cerium.