“This is a topic that is very hard to tell with out a PAR meter. See if you can borrow one from your LFS or rent one from Bulk reef supply. This will take all the guess work out of this question and any answers will be throwing darts at a board blindfolded. I can say corals will survive longer under low light conditions, when light is too bright or they are not in the correct par range they will bleach pretty quick.”
The light schedule has no meaning if we don't know the type and strength of the light and the tank size. As mentioned, a par meter is really the only way to know if there is enough light, but different tank size needs different amount of watts.