On a practical & environmental level, one of the major features of a lighting control system in a simple residential application is that lights can be dimmed to near full brightness (95% rather than 100%) without any discernable difference to the human eye. The immediate benefit is a significant saving, as that lamp life is extended and energy reduced.

The document attached below, written by lighting control manufacturer Philips Dynalite, describes basic lighting control system design for an apartment in a multi-dwelling development. It also incorporates general notes on integration with a keyless access system and lighting in the common areas of the building, as well as schematics to give to your Philips Dynalite lighting consultant.