Acclimation to metal halide?

[CHEAPREEF]

Hey guys, fianlly got my 40gal cube up and running last night. I changed from power compact (110 watts on a 20gal bin) to metal halide (175 watt 7" from water surface). How should i go about acclimating the coral frags to the light? Should i go with a filter to block some of the light for a while and slowly reduce the filter materal or should i go by length of time ect.. What's the best way to go about it? Thaks in advance.

Clinton