It all depends on your "Test Results" and has nothing to do with your lights
The "Exising" lights don't matter because since it's a new tank you don't have any coral in it.
Light Acclimation is a matter of using something to "dim/shade" some of the light so that you don't bleach the coral. I use Window Screen material (available at your hardware store) and try to use several layers to approximate what light was originally striking the coral. Then remove one layer per week.
do this for new corals, new bulbs in an existing fixture or a new fixture.