I have been having light issues and my corals did not do too well. First my bulbs went. Got some replacements and now my ballasts failed. I ordered 2 new workhorse ballasts for a 4x39w t5ho current fixture and just realized the ballasts in the fixture are 120volt and the ones I ordered are 277! I did not have many corals, but now they are really pissed and most have died or are dying! Do I have to return the 277 for the 120 or can I make it work before my whole tank is done. Any help would be appreciated!