The term lighting control covers everything from a single wall switch to complete building wide systems and everything in between. It is crucial that lighting is controlled correctly, both from a functional and energy consumption viewpoint. From a user perspective it needs to be intuitive and functional. Different circuits of lighting might need to be operated at different outputs depending on the time of day, the time of year, and the activity taking place in a space. This is particularly true for open plan multi-use spaces. Also, lighting control can deliver huge energy savings via occupancy sensing, pre-set timed reductions in output, automatically switching lights off outside of working hours, and ensuring that exterior lighting is only on when it really needs to be.
Given the option, users will tend to dim their lighting, and this is a direct reduction in the amount of energy being consumed. If there is no option to control lighting, or it is not simple to do so, this benefit is not achieved.