while I don't personally own one myself, I have played extensively with one at my LFS. If you purchase/own the AI controller for the hydra, there is a mode on there for "acclimation". I would definitely start there. I DIY'd my LEDS and the best advice that I can give you is start VERY Low on the light. The easiest mistake to make when moving to LED's is turning them up to high and bleaching out your corals. While the light will not look as bright the PAR is definitely there and it is really easy to bleach corals.
Maybe you could let us know what type of lighting you had on your tank before, along with the dimensions of your tank and what corals are currently in there/what you are planning to add? This will help provide the best information for you.
BTW I am jealous you have the Hydra's, while I love my DIY LED's (72 LED's on my 75gal, moving to a 150 today!) they are no where near as sexy as the Hydra's
