{TAIL ~ a package} containing {HEAD ~ the array} of light emitting elements and the substrate, the package enclosed with a window, wherein the window has two surfaces 
{ TAIL ~ a package } containing { HEAD ~ the array } of light emitting elements and the substrate , the package enclosed with a window , wherein the window has two surfaces
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH