What do DC and AC stand for?

DC: depending on the type of light source you are using, it stands either for direct current (Multi-LED: LED DC, in mA) or for the mean voltage (Multi-LASER MOD DC level in V).

AC: depending on the type of light source you are using, it stands either for alternating current/modulation (Multi-LED: LED AC) or how much voltage peak-peak is being supplied to the MOD OUT port of the control unit to drive the Multi-LASER (MOD DC in V peak – peak).