The LED based illumination device 1, wherein {HEAD ~ a reflective backing layer} is disposed adjacent to {TAIL ~ the first portion} 
The LED based illumination device 1 , wherein { HEAD ~ a reflective backing layer } is disposed adjacent to { TAIL ~ the first portion }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL