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