To add to my earlier replies, there is one benefit in starting the SEP2 plugin from Photoshop CS/CC rather than Lightroom. If I duplicate the layer with the image I want to convert to mono, I can change it into a Smart Object so that I can retain the settings I used and either make further adjustments later or just simply see what I did for a particular image. Unfortunately Photoshop Elements does not support Smart Objects, so this is one instance where the full version of PS has a definite advantage. If you like an effect from a particular combination of settings, it is always possible to save it as a custom preset
before exiting SEP2.
I also use SEP2 for a lot of my
COLOUR work! SEP2 has a very useful set of Structure controls which are very good for bringing out detail and texture. By setting the Blending for the SEP2 layer to Luminosity in the technique described by Simon Clarkson, I only use the brightness values for the converted image and retain the colour. A good example of this approach is with my PAD 62 image which can be seen at this link.
viewtopic.php?f=6&t=287&p=1555&hilit=glory#p1555Viveza, which is now included in the Nik software bundle also has a Structure control, but this consists of just a single slider and does not have the granularity of the enhanced version found in SEP2. Also, when I first started using SEP2 I bought it when it was also available a standalone product and did not possess the full Nik bundle at the time.
Simon's technique is described in this post:
viewtopic.php?f=2&t=162&p=1498#p1495