A portable electrical luminaire (1) having a supporting body (2) having an upper support end (2a) and having a lower support end (2b), having a lamp base (3) arranged on the upper support end (2a) for accommodating a luminous means (4), having a reflector (5) surrounding the lamp base (3) for indirect space illumination purposes, having a connection line (7) which is electrically connected to the lamp base (3) and having a connection plug (8) for connection to a power supply system (U.sub.AC), and having an electronic control device (11), which is designed to automatically limit the electrical power (P(t)) drawn from the power supply system (U.sub.AC) by the luminous means (4) to a predetermined value (P.sub.max).