a circuit arrangement for operating a discharge lamp with a high frequency current comprising input terminals for connection to a source of low frequency supply voltage , a rectifier bridge coupled to the input terminals for rectifying the low frequency supply voltage , and an inverter shunting a first capacitor for generating the high frequency current . the circuit arrangement incorporates two power feedback loops to feed power back to an output terminal of the rectifier bridge . as a result the circuit arrangement has a relatively simple configuration , causes only a very limited amount of harmonic distortion and can be realized with relatively cheap and simple components .