hey guys question about lighting

[kgb]

hey guys just wondering which is the better lighting. my friends have a 45 long and they want clams and hard corals and soft corals and was wondering if 250 watt 10k or a 175 10k is better.i am worried some what that the 250 watt might be 2 much light but they really want the blue/ white light . i heard from wayne that the 250 10 k have nice blue white color which they want. any suggetions