This is easily designed to be operable multi-level brightness adjustment control, it has the simple configuration that can be individually dimmed, power input unit (1), one bridge, its input power for being used to correct power accommodating portion (2), by correction inverted signal to the inverter section rectified voltage of the bridge of a high frequency, it is used to drive lamp 14 (5), generate a frequency of oscillation, for controlling the brightness of lamp, including a resonant section 8, it forms inverter section (5) to be applied to frequency of oscillation (4), and resonance circuit and lamp, control one electric ballast of operation is adjusted with a light, it frequency oscillator (4) and is coupled, frequency, its frequency of oscillation for being used to control frequency oscillator (4), controller 6; Fisherman Cao Kwang-je and for generating frequency control unit 6 one control signal; It include: still, the frequency control signal is changed by input fisherman Cao Kwang-je side input terminal voltage (V2) compared with the reference voltage (V1) of other terminals, output end (V3) is passed through to controller 6, for exporting second comparator (IC4), the variable resistance (resistance coefficient of VR1; CDS ; Q5 a voltage) is generated according to multi-level dimming by individually changing resistance coefficient for each ballast, second passes through the input voltage (V2) for changing one terminal of comparator (IC4), it is characterised in that for adjusting the brightness of lamp.
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