The light source module 1 wherein said heat radiating surface has {TAIL ~ a metal layer} formed on said surface on {HEAD ~ said other side} of said wiring board 
The light source module 1 wherein said heat radiating surface has { TAIL ~ a metal layer } formed on said surface on { HEAD ~ said other side } of said wiring board
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH