I have ran them both. The reeflux 12k is alot less blue than the evc 14k and a little brighter. But, my corals look better (to my eye at least) under the evc 14k. I can't believe how much it makes the colors pop. I have ran a whole assortment of bulbs and the evc 14k is my favorite so far. If you are not a fan of blue bulbs the evc 14k is probobly not for you. It is even bluer than my xm 20k I used to run. So that being said the reeflux 12k is better choice if you are seeking that bright white/blue look but your corals wil probobly look a little better under the bluer evc 14k.