I had not heard of this St. Preca before. Maybe we could somehow read his writing to get a sense of if he was pretty orthodox. Of course, I cannot make a judgment on whether he should have been canonized, but we must remember that saints did not get every single detail right all the time and had their imperfections. The mysteries he added to the Rosary seem to have been simply for the Society of Christian Doctrine from what I gather from the above. It is another thing though altogether to try to extend an unnecessary novelty to the whole Church though when since about I think the 1500s there have simply been 15 mysteries of the Rosary. Why not simply stick with what is tried and true? The 15 mysteries denote the different periods of life for the just soul, namely: joy, sorrow, and glory. Luminous seems kind of out of place though even though there is sort of a "filling of the gap," for lack of a better word, between our Lord's childhood and the beginning of His Passion in the Rosary mysteries. We could still contemplate and remember that time of our Lord's life with the 15 mysteries still. I have not read all of True Devotion yet as well as not having read The Secret of the Rosary, both by St. Louis de Montfort, but maybe he says something concerning the "gap" we find in the mysteries of the Rosary. The thing is though there is a principle of unnecessary novelty behind the adding of the mysteries of Light. It is not that the mysteries are in and of themselves evil at all. In fact, it is good to even think about our Lord's public life on earth, but we must especially first and foremost not forget His salvific Passion and Crucifixion and glorious Resurrection and Ascension as well as His miraculous Incarnation, the sending of the Holy Ghost at Pentecost, and the Assumption of His most Blessed Mother, which we will celebrate this next coming Wednesday.