The other problem with high blue light is that the plants not only cannot use it (without sufficient red and probably green) but algae can. I experimented with more blue lighting some years ago, and without question I had more problems with brush algae when the tank lighting was strong in blue. I was using two tubes, one 6500K and the second 10,000K and another time 11,000K. Algae did increase. Now I have one 6500K and one 5000K (5000K is warmer light, more red and less blue) and the algae problems disappeared. Over a period of five years these experiments were pretty convincing.