LakeEd
Achilles
I will admit not being one to read the long thread from "Grim Reaper" listed above... but my concern would be that you have such a high stock level of SPS in your tank... the shock of switching them over to the T5's less intense lighting... may end up with a very high die-off rate on your tank guy.
Hopefully, some people with larger tanks like you have (180), that have direct experience with those T-5 lights on an SPS dominated tank... will show up here and give you some 1st hand experience, not just "paperwork" knowledge.
Hopefully, some people with larger tanks like you have (180), that have direct experience with those T-5 lights on an SPS dominated tank... will show up here and give you some 1st hand experience, not just "paperwork" knowledge.