The K rating is only a rating. The Phoenix 14K is really a 20K plus lamp and is even probably bluer than most 20K's. Lots of 14K's on the market that measure over 20K. 20K's that are bluer than other 20K's ... 14K's that are really 10K ... 10Ks that are actually 7K's etc. In other words, dont assume the K rating relates to the true color temp. of the lamp because more often than not, it doesnt. You really have to ask about specific lamps to get specific impressions of the lamps color (and output) from those who use or have used the lamp.
The Ushio 14K actually measures around 10K. Some people see a yellow tint to the bulb, some call it white. It's a full spectrum lamp, or close. Only lacking much energy in the blue range (450nm). I would call it a warm white bulb. I can see a little yellow in the color but it isnt yellow like most 10K's which can measure well under 10K. Going from a bluer lamp like the Phoenix to an Ushio 14K you will see a big difference and probably perceive the Ushio having a yellow tint.
But they have pretty strong par and are quality bulbs. They Supplement well with blue floruescents.
The Iwasaki 14K is a cool white bulb. Pretty good par, just a very slight blue tint to no blue tint at all depending on individual perception. No yellow. I just call it a cool, crisp, white bulb. The Ushio is a warmer color lamp.
The Ushio 20K is a white/blue lamp. Has a definite blue tint but is not a super blue bulb at all. Ushio 20K is probably in between the Iwasaki and Phoenix in terms of color. Bluer than the Iwasaki, not as blue as the Phoenix and the Ushios blue tint is very nice. Doesnt wash out the colors like some of the bluer lamps can. BUT ... it doesnt have a load of par. Doesnt mean it wont have enough par but the Phoenix is a signifigantly higher par lamp and so is the Iwasaki and the Ushio 14K .
There is always the Radium. Better run on the M80 ballast but lots of reefers use them on electronics. Good par with a nice blue tint but again, not an overwhelming, monotone blue like the Phoenix (just my opinion, many reefers love the Phoenix). Many reports that the Radiums only last 6 months or so, especially on M80 ballast which is the spec ballast for these lamps. But with more electronic ballasts being used, I have read some reports that they dont last long on electronics either. They are quality made lamps but for some reason they dont seem to have the longevity of many other lamps. Some users love these lamps so much that they pay the price and stick with them even with the shorter life span.
Then there are dozens of other lamps to choose from. Just putting in my 2 cents on a few of the popular and high quality lamps relative to the Phoenix that may fit what you are looking for in terms of color. But these are just my individual opinions on how I think these lamps compare/look.
