I have the same fixture and tried the Pheonix 14K, had them in for about 4 months and just took them out last month... The Coralife ballasts don't like them and they flickered quite a bit.
I now am using Ushio 10K bulbs, they are more compatible with the ballasts and I actually like the light output, very white light not much yellow.
Not all bulbs work with all ballasts... I have read the Ushio and Kolorchrom (Geissmen), are both German made bulbs and have the best compatibility.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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