Do a search, there's quite a few threads on the topic. Lot's of success stories. I run all Kessils on several tanks and I'm growing SPS just fine. I started using them nearly 5 years ago when the A350s came out.
I have some MH ballasts that I use as door stops now :bounce3:
Do you have a tank thread or some pictures to share?
but some of them (mainly acroporas) dont react very well to kessils due to acclimation and I believe also due to the lack of some light spectrum.