A lighting system for detecting human presence based on changes in received radio frequency signals, said system comprising: at least one input interface; at least one output interface; and at least one processor configured to: - cause, via said at least one output interface, a first set of one or more radio frequency signals to be transmitted with a first transmission characteristic and/or received with a first reception characteristic, - detect, via said at least one input interface, whether changes in said first set of radio frequency signals are caused by a human presence, - detect, via said at least one input interface, whether said changes in said first set of radio frequency signals have a further cause, characterized in that the at least one processor is further configured to: - cause, via said at least one output interface, a second set of one or more radio frequency signals to be transmitted with a second transmission characteristic and/or received with a second reception characteristic upon detecting that said changes in said first set of radio frequency signals have a further cause, said second transmission characteristic being different than said first transmission characteristic and said second reception characteristic being different than said first reception characteristic, and wherein the second transmission characteristics and/or the second reception characteristics of the second set of radio frequency signals are optimized for identifying the further cause; - identify said further cause based on changes in said second set of radio frequency signals, and - provide, via said at least one output interface, output comprising said further cause or in dependence on said further cause; wherein said at least one processor is configured to detect said human presence and/or identify said further cause by comparing said changes in said radio frequency signals with signatures of known causes. at least one input interface; at least one output interface; and at least one processor configured to: - cause, via said at least one output interface, a first set of one or more radio frequency signals to be transmitted with a first transmission characteristic and/or received with a first reception characteristic, - detect, via said at least one input interface, whether changes in said first set of radio frequency signals are caused by a human presence, - detect, via said at least one input interface, whether said changes in said first set of radio frequency signals have a further cause, - cause, via said at least one output interface, a first set of one or more radio frequency signals to be transmitted with a first transmission characteristic and/or received with a first reception characteristic, - detect, via said at least one input interface, whether changes in said first set of radio frequency signals are caused by a human presence, - detect, via said at least one input interface, whether said changes in said first set of radio frequency signals have a further cause, - cause, via said at least one output interface, a second set of one or more radio frequency signals to be transmitted with a second transmission characteristic and/or received with a second reception characteristic upon detecting that said changes in said first set of radio frequency signals have a further cause, said second transmission characteristic being different than said first transmission characteristic and said second reception characteristic being different than said first reception characteristic, and wherein the second transmission characteristics and/or the second reception characteristics of the second set of radio frequency signals are optimized for identifying the further cause; - identify said further cause based on changes in said second set of radio frequency signals, and - provide, via said at least one output interface, output comprising said further cause or in dependence on said further cause;