The blackout period is used to put a dent in the Dino's. Then when lights come back on clean up the rest of them. You'll have to keep up with it. I heard high PH can help and of course using macro algaes to try and out compete the Dino's.
I've dealt with dinoflagellates and only thing that got rid of them was the chemical route using a product called dino X and I used that strait after a 3 day blackout so kicked the dino while it was down