Okay, lets see if I can help you with your questions. First the numbers 10k 6700 15k etc are all measures of the visible light spectrum that the bulb puts out. The brightest, most yellow color comes from a 6,700 or 10,000 k bulb. These will give you great growth but help very little with color. The actinic bulbs are more like 15k thru 20k and maybe even greater than that. If it were me (I used to run PC's before metal halides) I would choose 2 bulbs in the 6,700 or 10,000 k range, these will help with growth, follow that with 2 dual actinic or just actinic bulbs. The dual actinic will come in a 420nm and 460 nm, where as the single spectrum actinic will be either 460 or 420 but not both. I recommend a dual actinic that has both. These will help with your color.
My recommendation (summary) 2- 10,000k bulbs for daylight 2-dual actinic for the desired color.
The best part about it is that if you put your actinics on a timer and the daylights on a timer you can get a sunlight cycle in your tank, turn the actinics on for about 2 hours prior to the 10,000k, then run them both for 6-8 hours, then have the actinics on for about 1 hour after the 10,000k go out, simulates a dawn, daylight, dusk effect. Top that off with a couple lunar lights (typically 1 watt led's) and you can have a complete day and night cycle.
With these lights you should be fine with softies, zoos, shrooms, xenia, most leathers, and polyps. But PROBABLY NOT the anemone. Typically you need t-5 or metal halides to keep them.
