A controller comprising: an output for controlling one or more light source arranged to emit light to illuminate an environment; and an input for receiving a signal output from at least one sensor, being a depth aware or a 3D camera; wherein the controller is configured to: detect presence of a first user and at least one further user in said environment based on the signal output from the at least one sensor; detect one or more facial feature of the first user and the at least one further user by analyzing images captured by the at least one sensor; determine respective lighting preferences of the first user and the at least one further user; detect a respective orientation of the first user and the at least one further user based on the signal output from the at least one sensor; estimate a respective field of view of the first user and the at least one further user based on the detected respective orientation of the first user and the at least one further user; determine that at least one light source of the one or more light sources is positioned to emit light in both the field of view of said first user and the field of view of said at least one further user based on the stored information on the location of the one or more light sources and on the estimated field of view of the first user and the at least one further user; arbitrate between the determined respective lighting preferences of the first user and of the at least one further user and determine light settings to be applied to the at least one light source, being positioned to emit light in both the field of view of said first user and the field of view of said at least one further user, based on arbitration, and control said at least one light source based on the determined light settings, characterized in that the controller is further configured to perform said arbitration based on a comparison of a proportion of the field of view of the first user in which the light emitted from the determined at least one light source is incident, and a proportion of the field of view of the at least one further user in which the light emitted from the determined at least one light source is incident; and the determined light settings are based on (i) the lighting preferences of the first user if the proportion of the field of view of the first user is greater than proportion of the field of view of the at least one further user, or (ii) the lighting preferences of the at least one further user if the proportion of the field of view of the at least one further user is greater than proportion of the field of view of the first user. an output for controlling one or more light source arranged to emit light to illuminate an environment; and an input for receiving a signal output from at least one sensor, being a depth aware or a 3D camera; detect presence of a first user and at least one further user in said environment based on the signal output from the at least one sensor; detect one or more facial feature of the first user and the at least one further user by analyzing images captured by the at least one sensor; determine respective lighting preferences of the first user and the at least one further user; detect a respective orientation of the first user and the at least one further user based on the signal output from the at least one sensor; estimate a respective field of view of the first user and the at least one further user based on the detected respective orientation of the first user and the at least one further user; determine that at least one light source of the one or more light sources is positioned to emit light in both the field of view of said first user and the field of view of said at least one further user based on the stored information on the location of the one or more light sources and on the estimated field of view of the first user and the at least one further user; arbitrate between the determined respective lighting preferences of the first user and of the at least one further user and determine light settings to be applied to the at least one light source, being positioned to emit light in both the field of view of said first user and the field of view of said at least one further user, based on arbitration, and control said at least one light source based on the determined light settings, characterized in that the controller is further configured to perform said arbitration based on a comparison of a proportion of the field of view of the first user in which the light emitted from the determined at least one light source is incident, and a proportion of the field of view of the at least one further user in which the light emitted from the determined at least one light source is incident; and the determined light settings are based on (i) the lighting preferences of the first user if the proportion of the field of view of the first user is greater than proportion of the field of view of the at least one further user, or (ii) the lighting preferences of the at least one further user if the proportion of the field of view of the at least one further user is greater than proportion of the field of view of the first user.