Your coral seems to be complaining, I would introduce the light in a less abrupt fashion ... Try adjusting the height of your lights slightly, note the changes in your coral as you you go along....
Ricky,
Don't forsee much complications. You should monitor the temperature closely, as even a degree either way could traumatise the inhabitants of your tank. If you do notice a considerable increase of temperature, you should invest in a chiller. Or you can raise the lights higher and see...