Thanks for link.  The light is placed just forward of the area occupied by the lower shell when closed.  One can see the familiar marks left from the lower shell's seal on the upper shell's ceiling.  

My 2720 has less distance available on the upper shell toward the front wall to clear the lower shell, so a light like this would be located within 2 feet of the front.

If a light could be recessed then clearance restriction to the closed lower shell goes away.  I just haven't seen this done and I wonder if there is a condition that I'm not considering.