Ushio 20K, I love the color of the bulb. Not at all to blue, just right IMO and I don't care for a high blue 20K look but this is a very nice color. I got the 400 watters on a big bag deal with the bulbs also and ended up loving the color. I would love to run this bulb in a 250 but wonder if it will give the same look, just without as many watts? I may use 2 400's in the center, especially since I have them laying around and 2 250's on the ends. I run 4 halides since my tank is 7 ft. The 400 bulbs are new and the 250's I have are all real old so that would only put me buying 2 new bulbs to try out the 250 ushio 20k's next to the 400's also to see if the 400 is much different than the 250's.
I personally will probably swap out the 400's to all 250's when the bulbs are spent just to save on the electric bill, ya know? I have all 4 250 ballasts also from my old tank so I can play with what will work and if a 400 really is needed without having to buy ballasts and bulbs to just see.
I don't think I will have anything that "needs" the intensity of a 400 and my tank did real good even down on the sand with SPS with 250's in the old tank.
Also I love the look of the hamilton 14K I was running on the 250's but the ushios look like the hamiltons did with my added actinic I had to run to give the stuff that final pop you get from actinics. So with the ushios I am going to try to run just the halides during the day and have the actinics come on just for the dawn to dusk look to save energy.
I am also planning a gradual ramp up of lights by having the actinics first, then a set of T5 daylights for a time, then the halides and back down. My tank is the center of the home and I want light all day, not just from 1-7ish since a tank can't really have halides burn all day. Poolkeeprs tank looked great and he has this lighting theam and his t5's looked great and was plenty bright to have the tank look good during non halide times.