A wavelength conversion apparatus capable of keeping high wavelength conversion efficiency for a longer time than ever before is provided. The method includes establishing an insulating layer on a substrate such that at least one seed region, which exposes a surface of the substrate, is formed. When the crash attenuator is impacted by a vehicle, the front section and mobile sections telescope down in response, and thus, are effectively longitudinally collapsed. Another embodiment provides a fixed receptacle mounted vertically that routes all edge connector traces to the bottom surface of the test tray, again, suitable for engaging with a bed of nails-type test board.