If you will have the lights in the next couple of days, I would just leave the zoas until you get the new lights. You will want to start with LOW settings on the new fixture and slowly ramp up over weeks. When I first went to LEDs, I nuked a bunch of coral because I set the light intensity way to high. After figuring out what works, it turns out I am running my fixture at only 35% white intensity and 45% blue intensity.