I personally do not like the blue look.....I have tried XM 10k's, Geisemann 14K's, Radiums and the phoenix 14K's on my M80 ballasts. (Keep in mind I do not run any supplemental actinics)
My preference is for the XM 10K's, they are superbright (I mean blindingly bright) and not as yellow as the XM 10K DE's on the same ballast, the geisemann are alright colourwise but not as bright......The radiums and phoenix look almost exactly the same colour to me and are really really blue
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