My own experience is with albumen/arrowroot prints. i have found no difference
in exposure times from what I would have expected had I beem making a salt
print. I use a mercury vapour graphic arts lamp of which the radiaition peaks
at differet levels so it is suitable for different graphic arts processes.
This gives rise to the questions as to which wavelength is silver chloride most
sensitive and do black light tubes give sufficient output at that wavelength.
Terry King