A lamp has a power management circuit 11. In response to that determination, a second search space is utilized such that a number Y of blind detections for a user equipment UE in the determined radio framesubframe is greater than a number X of blind detections for the UE in the radio framesubframe if a first search space were utilized. An electrophoretic layer is arranged between the first substrate and the refractive index variation layer. The controller uses the TDoA data and also time of arrival data from its local receiver stations to perform a multilateration to determine the location of the aircraft. Furthermore, in the network configuration management method, the network configuration monitoring node grasps the configuration of the entire P2P network from the collected information on the network configuration. The fundamental wavelength beam is directed into the optical parametric oscillator cavity and incidents on nonlinear crystal having a Brewster cut at each end for fundamental and preselected wavelength beam without substantial reflection loss.