My dome light housing melted.
Actually it melted a long time ago, but now i have a new one and don't want it to happen again.

The one that melted was a replacement. I think I threw out the original. Stupid.

First question: Was the original housing plastic like the replacements?

My chrome on the original was pitted, which is why i question whether it was plastic, but mostly it's why i replaced it. I never had a problem with it before, but I also never had a lens on it before. I noticed the lens had a brown spot and upon inspection, it was clear that the bulb had melted the housing... glad I found it before it melted the wires or caught fire to the headliner.

I always had a 211-2B (blue) bulb in it. The specs are the same as the 211-2 and the OE 211-1 bulb.

Any thoughts on why the bulb melted the housing, and what I can do to stop it from happening again? For now I left the lens off to help dissipate the heat.