James is right on.
I like to start new corals on the sand bed,and kinda shaded for the first day or 2.Then I'll just move them out into full light,then start working them up from there.
I've also got to where I keep my eye on the lighting thats over the tanks the corals if at the LFS.If there under less light than I can provide,then I photo-acclimate.If their under just as more more light,then I just put em where I want em.