Acro needs more than light, they are most sensitive to flow and water conditions. True acro need high light, but thats only part of the recipe.
They need high calcium, and while everyone say "Duh" to knowing they need 400 cal and blah blah blah, thats really a difficult thing to just drop into while keeping everything else stable if your used to keeping simple softies and so on.
Sorry I cant answer your question with a more clean answer with such limited info about your set up and exp base. The 5w per Gallon is only a rule of thumb, its not the defining factor for SPS long term success. IMO
Good luck with your addiction if you decide to go SPS.