Hi Shango, I think you have a good combination. I run 6700k over my tanks and the plants seem to do well. I have seen photos of aquariums with the GE 9325k bulbs (which look very good and are supposed to be good for plant growth) but unfortunately they are not available in all wattages and/or pin configurations. I would figure that your 6700k / 10000k combination would give you a spectrum of approximating 8300k, do you like the look and do your plants grow well? Roy _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member