A luminaire (102; 302), comprising: at least one solid-state light source (104; 308); at least one photosensitive transducer (218; 304) responsive to at least one physical characteristic indicative of at least one light condition in an ambient environment; a lamp control subsystem communicatively coupled to the photosensitive transducer (218; 304) to receive signals indicative of the at least one light condition in the ambient environment sensed by the photosensitive transducer, and wherein the lamp control subsystem is configured to: verify whether at least one aspect of the signals is within a threshold of an expected value for the respective at least one light condition; wherein the at least one aspect that is verified includes a time of detection of the at least one light condition and the at least one light condition is indicative of at least one daily event characterised in that the lamp control subsystem is further configured to: control a supply of power to activate the at least one solid-state light source responsive at least in part to the signals if verified; and control a supply of power to activate the at least one solid-state light source according to a schedule if not verified. at least one solid-state light source (104; 308); at least one photosensitive transducer (218; 304) responsive to at least one physical characteristic indicative of at least one light condition in an ambient environment; a lamp control subsystem communicatively coupled to the photosensitive transducer (218; 304) to receive signals indicative of the at least one light condition in the ambient environment sensed by the photosensitive transducer, and wherein the lamp control subsystem is configured to: verify whether at least one aspect of the signals is within a threshold of an expected value for the respective at least one light condition; wherein the at least one aspect that is verified includes a time of detection of the at least one light condition and the at least one light condition is indicative of at least one daily event characterised in that the lamp control subsystem is further configured to: control a supply of power to activate the at least one solid-state light source responsive at least in part to the signals if verified; and control a supply of power to activate the at least one solid-state light source according to a schedule if not verified. verify whether at least one aspect of the signals is within a threshold of an expected value for the respective at least one light condition; wherein the at least one aspect that is verified includes a time of detection of the at least one light condition and the at least one light condition is indicative of at least one daily event characterised in that the lamp control subsystem is further configured to: control a supply of power to activate the at least one solid-state light source responsive at least in part to the signals if verified; and control a supply of power to activate the at least one solid-state light source according to a schedule if not verified. control a supply of power to activate the at least one solid-state light source responsive at least in part to the signals if verified; and control a supply of power to activate the at least one solid-state light source according to a schedule if not verified.