Laziness!. Honestly though, lack of time. Too much other stuff to do and just got a new job. Finishing off the plumbing so I can get the tank cooking for real is the priority at this point. Plus, I want to see how things do with pure LEDs first. People seem to be doing very well with pure Radions. If it works well, it's got a number of plus factors (less electricity, less complicated programming, etc.).