BML is coming out with a controller in 2-3 months, so when I just ordered my 2 fixtures, I'm holding off on getting manual dimmers and going to get the controller instead when it comes out. Cara informed me to just run them for shorter periods. This won't be a problem for me on my 135G, since I plan on running 2 planted+ in the center, with a BML 10000k on the front lid (60 degree), and a 6300k dutch 75 degree on the back.
This is on a 36" deep tank, so that is why I went with more concentrated angles along with putting them on the front and rear edge of the tank.
I figure I can run the planted+ for 9 hours a day, with maybe 4 of the bml to give the peak boosts in the mean time.
OH, and yes, this is the new XB series, so the 10000k is 41% brighter, and the 6300k is 37% brighter.