Actinic lighting is a rather loosely defined thing, as is color temp in terms of how it applies to aquarium lighting. In general, actinic lighting is blue to purple spectrum lighting. Look at the varieties available in actinic lighting: actinic, pure actinic, actinic+, 420nm, 460nm, blah blah blah. In the end, its all about color preference with actinic lighting because they tend to have rather little PAR when compared to bulbs at the yellow end of the spectrum, ie daylight. I'm of the opinion that it is good to provide full spectrum lighting. This is well provided by most bulbs at the yellower end of the spectrum; even 6500Ks have some blue in them. However, many 14K and 20K bulbs tend to have one huge spike at some wavelength in the blue spectrum and rather little elsewhere (much like "actinic" lighting). If anything, your 14K is lacking on the yellow end of the spectrum rather than the blue or "actinic" end. Not knowing what specific bulbs you use, however, I do not know for sure. In the end, you'll still get growth out of a 14000K or 20000K bulb, but it won't tend to be as fast as you would get with a good 10000K or 6500K bulb.
