Microprocessor controlled power pack (1600 J) with 3 lamp base connections, stabilized colour temperature on 2 main connections, variable output distribution (asymmetrical/symmetrical), 6.7 f-stops for main connections, 4 f-stops for reserve connection, in 1/10 or 1/3 f-stop intervals, display simultaneously in joules and f-stops, joules switchable to percentage, fully illuminated control panel and LCD-display, flash duration selectable on main connections, short-time exposure selectable, CTC (Colour Temperature Control) for uniform or deliberately variable colour temperature with broncolor FCC (Flash Colour Chronoscope), proportional modelling light over entire output range.