a power supply for an arc lamp . it includes a dc converter which has an input , an output , and a circuit for increasing the voltage received at the input and for supplying the increased voltage to its output . a current sensing circuit is provided for controlling the amount of current delivered to the output . an output &# 34 ; h &# 34 ; bridge is coupled to the output of the dc converter for generating a squarewave in response thereto . the power supply is capable of quickly igniting and re - igniting arc lamps , is relatively inexpensive to manufacture and it relatively light in weight . the power supply can accept either an ac or dc source over a wide voltage range and increases or decreases the input voltage compared to the output voltage .