Dave, was having the same problem with finding a replacement for the 14k Phoenix. Went with one new style Hamilton 20k bulb and put it side by side with my Phoenix 250 watt both driven by an M80 ballast and one cant tell the difference unless I tell you which side is which. Now I have all Hamilton 20k bulbs and they are in my opinion a great replacement for the Phoenix. Really excellent job by Hamilton matching the spectrum of the Phoenix. Now have 2 each 250 watt and one 150 watt that is in the middle which runs on an electronic ballast and couldn't be happier. With Phoenix coming and going will stick with the Hamilton since I feel they are here to stay. Hope this helps.
Mark