Environmental condition control system using wireless signal strength

A system for controlling an environmental condition, such as lighting or temperature, in a targeted space, the system comprising at least one sensor device 141 for detecting an environmental condition and providing a corresponding detected signal, a plurality of environmental condition varying devices 150, such as LED lights, for varying the environmental condition of the targeted space, wherein the sensor device and the environmental condition varying devices are equipped with wireless communication means 141a, 150a for communicating with each other. The system further includes a controller 143 configured to determine an estimation of the environmental condition provided by each of the environmental condition varying devices based on a signal strength of a signal sent from each of the environmental condition varying devices to the sensor device, and to compare a detected signal from the sensor device with a predetermined environmental condition value, and to generate a control signal to control at least one of the environmental condition devices based on the estimation. Distance may be determined between the sensor and each light based on the signal strength.