to regulate the operation of the illumination device 6 based on the control signal s 2 the controller 4 communicated with the multi function sensor 3 will send a control signal s 3 to the multi function sensor 3 through optical transmission under user 39 s operation the multi function sensor 3 will produce the fan control signal s 1 and the light control signal s 2 based on the control signal s 3 the controller 4 can be defined as an administrative controller which is capable of configuring the parameters of the fan regulator 1 and the light regulator 2 by transmitting parameters set to the controller the parameters will be optically transmitted to the fan regulator 1 and the light regulator 2 via the multi function sensor 3 on the other hand the controller 4 is capable of reading the parameters being set to the fan regulator 1 and the light regulator 2 by the administrator the parameters of the fan regulator 1 and the light regulator 2 will be transmitted to the controller 4 via the multi function sensor 3 by optical transmission the controller 4 can be also defined as a user controller which is capable of changing the parameters of the fan regulator 1 and the light regulator 2 within the ranges configured by the administrative controller through optical transmission the user controller.