I would have to say that the phoenix bulbs have more blue look to them, my Geismann 14500k bulbs burn white. I have always used geismann bulbs but recently have been experimenting more. Somehow I always end up using the geismann, they look the most natural. Good luck! Cheers-MM 
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90 gal SPS display+65 gallon mixed reef
GEAR: Korallin calcium reactor, bio pellets, digital aquatics controller, Tunze ATO, MP40, 4 x Tunze 6105 w/controller, Reef Octopus Xp3000 ext, 2x250w MH, Futura LED.
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