Abstract: A lighting system comprising, a light source, a controller arranged to drive the light source, a memory in communication with the controller, the memory being arranged to store at least one parameter giving at least one of a history of at least one variable characteristic of the light source; and/or at least one fixed characteristic of the light source, wherein the controller is arranged to drive the light source according to one of the stored history of the variable characteristic, the value of the fixed characteristic or both.