Originally Posted by
xkaes
My heads are slightly different that yours, but that is inconsequential. As to the heat absorbing glass, it looks like typical window glass, but I have to assume that it is there to absorb heat from the bulb since it is on the TOP of the condenser assembly. If you look closely around the edges, you will see a thin brass spacer ring on either head. It's easy to assume that it is more than plain window glass, but that would be a guess on my part. Maybe plain glass accomplishes the task! And since it is built-in, it has got to accomplish more than just "scratch/dust" protection.
Does the heat from a 100 watt bulb actually pose a threat to a glass condenser? Curious minds want to know!
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