Time to consider lighting for my new 75 gal reef project. I have a JBJ that is a 4 fixture setup. Max @ 260 watts. Could some one please explain the benefits and/or differences between 6,500K bulbs and 10,000K bulbs. Are actinics all the same or do they come in variable ratings. The vendor i use has 7100k actinics and something called true blue 03 actinics. Any differences? Any guidance would be appreciated.