I just remembered I had my infrared thermometer in the car... here at work with me. So I tested my little, 7W, festoon overhead lamp. The peak I recorded after 3 minutes was 358F. I then calibrated against my own skin and recorded temps in the mid 90s... as they should be.
An 1156 bulb, which I would guess is somewhat akin to the 24-5050 panels is about 27W. So my little overhead is about 1/4 the wattage.
Hopefully someone will post their results from an incandescent 1156... or at least some kind of 18W+ incandescent bulb. I'm pretty curious.