responds to the chopper circuit in order to perform a soft starting operation in which the inverter circuit generates a given high frequency voltage to start and operate the discharge lamp prior to the generation of a given level of d c voltage generated by said chopper circuit an inverter control circuit coupled to the inverter circuit is provided application_number US 95321792 A description fig1 shows a fluorescent lamp device a longitudinal fluorescent lamp 1 is attached to a lamp fixture 2 in which an electric circuit arrangement 100 of the present invention described below is installed fig2 shows a first embodiment of electric circuit arrangement 100 of the present invention circuit arrangement 100 shown in fig2 is composed of a power supply circuit 40 a chopper circuit 50 an inverter circuit 60 a chopper control circuit 70 an inverter control circuit 80 and a lighting circuit 90 reference numerals 3 4 denote input terminals which are intended to be connected to an a c voltage such as 100 volts 60 hz a full wave rectifier circuit 5 is connected to terminals 3 4 through a transformer 6 two output terminals 7 8 of rectifier circuit 5 are interconnected to a capacitor 9 an output voltage of power supply circuit 40 is applied to chopper circuit 50 a field effect.