The ballast card is designed for 2 lamps up to 350 W each. The current is limited to 2,5 A per lamp. The ballast card has its own microprocessor. It receives data from the main processor and executes the commands like lamp on, lamp off, dimming etc.
It also ignites the lamps with an intelligent algorithm, controls the lamp current and gives back the status of the lamp, the arc current, errors etc.