Abstract: The invention relates to an illuminator, especially a runway approach flashlight, for forming a directable, generally rectangular light beam, comprising a light source, such as a xenon lamp, an illuminator body (1), and a reflector supported to it and comprising a generally cup-like rear reflector (2) fitted behind the light source, and means for directing the light beam. To achieve a light beam of a desired shape and to enable it to be directed, the reflector further comprises an ellipsoidal counter reflector (3) fitted in front of the light source, the main axis of the counter reflector being substantially parallel to the shorter side of the light beam, and the reflector (2, 3) is supported to the illuminator body by means of joints (11), so that the reflector can be tilted with respect to the illuminator body (1).

Abstract: The invention relates to a power supply and control unit for a light system, especially an airport approach light system, for making a number of lights go on and out as a progressive light front. The invention is also concerned with a lighting unit (1) suitable for use in combination with this power supply and control unit.