HI Michael
You forget one very important thing
With Calciumreactors you can add ( depending of the Material which you use ) a lot of Po4 and H2Co3 in your system.
The Ph Level will going down and this brings Po4 back in solution.
Blling light will work as an PH Puffer and will stabilize the PH against and Calcium reactor
this will bring more stabilitiy in your tank
If you add the Trace Elements which are developed for grow and coloration
you will add the Trace element in the right ammount how the corals grow and not more or to much.
Here you can see some tanks which use the Balling light system several years
