From a reader:
I prayed the Rosary with some others today, but since it was Thursday they used the Luminous Mysteries. I, however, meditated on the Joyful Mysteries. Is that legit? Would I still qualify for an indulgence if I was meditating on different mysteries from the others?
Yes. I think you would.
Go ahead and meditate on this or that set of mysteries as it pleaseth you.
An argument can be made for having everyone on the same page. Communal recitation does imply doing something in common, right? Some people might find it a bit distracting or disharmonious to have meditations on a different set of mysteries going on. That said, if you want to do your own thing, then do it. Of course that undermines a little the communal aspect of recitation of the Rosary, but… whatever.
I know that some people have not embraced the “Luminous Mysteries” for their own meditation. Fine. They don’t have to use them if they don’t want to. The mysteries are suggestions for our benefit, not iron-clad channels into which we are forced.
Our devotions don’t require perfect lockstep with everyone else.