Here’s an interesting thing. We recently switched to a different exposing booth (much larger for full large-format pt/pd printing) and the bulb is very different. It’s much better for Pt/Pd for sure!
It pulled the over-all printed gamma way down after accounting for min-time max-density. Very interesting indeed. The spectrum of your light can determine the gamma of your print quick dramatically. This is a screenshot showing linear and printed (green line) values. We do 256 step linearization in-house.