I am so far behind in the book, but my actor kid got several auditions/callbacks for the light saber building ‘experience’ at Disney World (so I still remember his lines from running them with him) and at the time, blue was active/physical with the Force, green was more internal Force usage (but still able to fight), red was power and purple was a very in-your-face internal and external Force user. They ended up going with a different set of lines for the colors (emphasizing noted Force users for each color) but I thought it was kinda cool at the time (spring 2019).