A lighting device is provided for lighting control of an LED module based on an externally provided dimming control signal. An output feedback circuit provides feedback to a controller such that the controller may regulate the output of the welding source of power. The spacer includes an inner projection that projects radially inward and an outer projection that projects radially outward from the main wall of the jacket. Then, the embedment member is slid in such a manner as to introduce the projections into narrow portions and wide portions, thereby retaining the embedment member to the core. Accordingly, the bearing holding structure may be easily formed with simpler shape of the holding surfaces. The composition contains a major amount of resinous component that contains A) 0 to 100 % by weight of one or more graft polymers B) 100 to 0 % by weight of a thermoplastic vinyl polymer, and a minor amount of a mixture of a) a modified or unmodified polyalkylene ethers and b) a phenolic oxidant wherein the weight ratio : is 20:1 to 1:1.