Do mattress manufacturers actually test for this type of ignition source? I’m sure they must do "Open flame" ignition tests, but I’m not sure that would fit the same criteria.

I put my thermocouple thermometer probe on a standard A-19 100-watt bulb in my keyless basement light that had been on for over an hour and the maximum temp I recorded was near the base of the bulb, which was 245.4 degrees F.
It would be interesting to how much time it would take for the foam material to reach the temperature needed to begin combustion.

Even so, I can’t help wondering... if a CFL had been installed instead of an incandescent bulb, would this situation still have occurred?