For example, a GX53 type cap structure is used for the cap portion of the lamp device, and a metallic material excellent in thermal conductivity may be used at least at a position where {HEAD ~ the cap portion} comes into {TAIL ~ contact} with the heat radiating body 
comes into
For example , a GX53 type cap structure is used for the cap portion of the lamp device , and a metallic material excellent in thermal conductivity may be used at least at a position where { HEAD ~ the cap portion } comes into { TAIL ~ contact } with the heat radiating body
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