Thanks to Technomax I had the opportunity to change my 10k Ushio 250w DE bulb to a 14k 250w Phoenix. All I can say is WOW!! Night and day in comparison. I love the color of the 14k phoenix and you do not need any Actinic Supplementation. All the corals are popping with color. Very cool; for those running 10k once you change to a high kelvin you will not ever go back.