A method for setting and adjusting light emitted from an adjustable lighting device is disclosed. For example, a mobile device may be configured to communicate to a server rating information for the contacts. A designated set of control signals is used in an associativity control logic for corresponding with an external control logic. The signal emission assembly is disposed in the receptacle hole and includes a holding cover disposed in the receptacle hole and including a first holding structure in the receptacle hole and a second holding structure protruding from the inner surface and a signal emission device.