This is because {HEAD ~ a lamp} in {TAIL ~ the projector apparatus} needs to be cool down, before electronic power supply is shut down 
in
This is because { HEAD ~ a lamp } in { TAIL ~ the projector apparatus } needs to be cool down , before electronic power supply is shut down
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH