If this is your first LED fixture, you should always start at a low intensity regardless brand and type of fixture, or your coral will start melting like ice. If you had MH, you can start at about 30% intensity and start to adjust to 80% within 1 week. Most people run AI Sol for 80% so I would assume Vega would be the same. I know someone running full SPS tank crank up their AI SoL 100% in a long run.
If you switch from T5, you should start it lower like about 10 to 20% and move up to 50% in a week and then move it to 80% in couple weeks.