And your point is .....?
Sure, we can play 'what if ...' until the cows come home. We also have to examine our assumptions.
Can we assume that it was an exposed lamp, and not an over-lamped one? Or that the foam had a mattress-appropriate higher ignition temperature?
Oddly enough, the NEC ASSUMES that enclosed fixtures are too cool to ignite stuff. The ONLY fixtures that are evaluated with regards to ignition temperatures are the illuminated closet rods (something I am happy to take credit for- it was my proposal that got the ball rolling there).
I've placed my mattress in most every possible place, but I've never thought to put it on the ceiling. You can't fix stupid.
