Hi Odie. While the 10ks averaged a bit higher PAR, our consumers were requesting a fixture with a less blue tint. The 7ks gave better aesthetics to their tanks while not sacrificing the fixtures high light output.
As for a dimmer, we currently have the capability for one and actually have a tester model in it's trial period. The only concern is it's price point and economically producing these units without sacrificing any quality is something we're trying to work out.