automatic lighting systems for commercial buildings

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hi there . i am in cape town , south africa and am looking for some assistance about automatic lights. i am a sales rep for a lighting company and want to start a project for a company that requested a automatic lighting system . basically what is needed is when an occupant leaves his/her office the lights must switch off automatically and should go on when re-entering. it should also have a dimming facility so that the lights in the office dims as the outside light gets brighter and vice versa. please mail me any info relevant to this and also suppliers of these products within south africa. your help would be greatly appreciated. my contact details are : SHAHEED JOSEPH CELL +27 84 6225308. E-MAIL : S.JOSEPH@NJABULO-LIGHTING.CO.ZA