I am looking for a Unilamp or the equivalent.

This was a tilted green box that provided green light over an area to
view resist spins for defects.

This is NOT a Hg Lamp with a green filter and it is NOT a bright light
box.

It worked by illuminating the wafer and spin non-uniformity show due to
interference effects with the green light.

The Unilamp was a common tool in the 1980s, and the manufacturer is no
longer in existence. Advanced semiconductors doesn't need them, it was a
1980s technology and MEMS processing, which seems to be a 1980s
technology for processing could use them.

Ed