I'm just testing a few new papers with our 8300 and decided to have a closer look at the output of the monochrome print mode, in terms of its perceived neutrality under different lighting. Note that this is initially a 'how it looks' comparison rather than getting the spectro out ;-)
I also created a set of colour profiles for different lighting conditions and optimised them for B/W (by means I'd hope to be able to discuss before too much longer ;-) )
In relatively dim tungsten lighting, the mono mode prints have a slight tinge of magenta about them, which moves to greenish in a north facing window.
To be fair I needed to place test prints next to each other and even then several people couldn't see the differences. However, by comparing profiles created for different lighting, it looks as if the 8300 mode mono output is optimised for lighting 'around' 5000K
The 'Color Settings' tab in the print plugin does have a green/magenta adjustment available, which would seem to be the place to allow for viewing lighting.
I was wondering if anyone had experimented further with these adjustments and/or the curves option below it, which looks to be a good place to apply a linearising curve, rather than perhaps making a correcting profile with QTR