I'm replacing the bulbs in my 260 watt PC unit and also in my 108 watt T-5 unit. I'm not replacing them all at the same time but I am buying the bulbs monday. I currently have 10,000 K with actinics. I'm thinking of getting 12,000 K with actinics. What is best for the corals and also, what is the best for viewing and pictures. For some reason my camera picks up a yellow hue with the 10,000 k and the person at aqua cave said that the 12,000 K gives of a whiter light. I'm hoping to get as much info on this today so that I can place my order tomorrow. Thanks for your time people. I also appreciate all the help you guys have given me in the past. Because of you guys, my tank is better than I ever imagined. :rollface: