An illumination system for generating a predefined illumination pattern on an area, the system comprising: a plurality of luminaires, each luminaire being arranged to generate a contribution (210, 210') to said predefined illumination pattern on a part of said area; a plurality of cameras, each camera associated with at least one of said luminaires for capturing an image of an illuminated part of said area including the contribution generated by said associated luminaire; a data storage device for storing a light plan including positional information and aiming information for each luminaire; characterized in that, each luminaire comprises an orientation adjustment mechanism; the system further comprises a control unit adapted to facilitate the generation of the predefined illumination pattern by: evaluating one of said images to determine a deviation from the predefined illumination pattern for the illuminated part of said area captured in said image; selecting a luminaire associated with said deviation from said plurality of luminaires based on information contained in said light plan; and generating an orientation adjustment signal for the selected luminaire based on the determined deviation, wherein the orientation adjustment mechanism is an electronically controllable orientation adjustment mechanism, and wherein the orientation adjustment signal is for controlling the electronically controllable orientation adjustment mechanism; wherein the control unit is adapted to iteratively: receive and evaluate an updated image of said illuminated part for determining an updated deviation from the predefined illumination pattern following an orientation adjustment of the selected luminaire; and generate a further orientation adjustment signal for the selected luminaire in order to reduce the updated deviation until said updated deviation falls below a predefined deviation threshold or until the number of iterations exceeds a predefined iteration threshold. a plurality of luminaires, each luminaire being arranged to generate a contribution (210, 210') to said predefined illumination pattern on a part of said area; a plurality of cameras, each camera associated with at least one of said luminaires for capturing an image of an illuminated part of said area including the contribution generated by said associated luminaire; a data storage device for storing a light plan including positional information and aiming information for each luminaire; characterized in that, each luminaire comprises an orientation adjustment mechanism; the system further comprises a control unit adapted to facilitate the generation of the predefined illumination pattern by: evaluating one of said images to determine a deviation from the predefined illumination pattern for the illuminated part of said area captured in said image; selecting a luminaire associated with said deviation from said plurality of luminaires based on information contained in said light plan; and generating an orientation adjustment signal for the selected luminaire based on the determined deviation, wherein the orientation adjustment mechanism is an electronically controllable orientation adjustment mechanism, and wherein the orientation adjustment signal is for controlling the electronically controllable orientation adjustment mechanism; wherein the control unit is adapted to iteratively: receive and evaluate an updated image of said illuminated part for determining an updated deviation from the predefined illumination pattern following an orientation adjustment of the selected luminaire; and generate a further orientation adjustment signal for the selected luminaire in order to reduce the updated deviation until said updated deviation falls below a predefined deviation threshold or until the number of iterations exceeds a predefined iteration threshold. receive and evaluate an updated image of said illuminated part for determining an updated deviation from the predefined illumination pattern following an orientation adjustment of the selected luminaire; and generate a further orientation adjustment signal for the selected luminaire in order to reduce the updated deviation until said updated deviation falls below a predefined deviation threshold or until the number of iterations exceeds a predefined iteration threshold.