Did you get these bulbs to try out? I'm looking at them to replace my XM 10K bulbs. I'm also considering the XM 15K and 20K bulbs. I'm using Icecap ballasts,so I can run any one of these bulbs. I am finding my 10Ks to be too white and my corals all tend to fade out to browns even with 2x96w actinic PCs. I want more blue, but I don't want to go extreme with it.

I ended up ordering new XMs. Thinking about getting a couple radiums while J&L's sale is on though. If i remember to get them ill post pics