The invention provides a control method used for the no-flash starting of a high-intensity
gas discharge lamp. Before the ignition starting is carried out on the high-intensity
gas discharge lamp, the current of the lamp is first controlled to be constant and the value of the current is led to be higher than the rated current. The
voltage of the lamp is subsequently judged; when the stable
voltage in the pre-heating stage of the lamp is reached, the current of the lamp is continuously reduced, thus gradually increasing the
voltage and power of the high-intensity
gas discharge lamp; when the current of the lamp is reduced to the rated current of the high-intensity gas
discharge lamp, the current of the lamp is controlled to be reduced or increased continuously; meanwhile, the voltage of the lamp is sampled continuously; when the voltage of the high-intensity gas
discharge lamp is sampled to approach or reach the rated voltage of the lamp, the lamp enters to normal work with
constant power. The invention controls the whole starting process of the lamp by controlling the current of the lamp and gives out corresponding control signals in different stages, thus leading to no flash of the high-intensity gas
discharge lamp, smooth change of colour temperature, extended colour change and
natural power transition; furthermore, the service life of the high-intensity gas discharge lamp is increased.