When you have basically decent bulbs for plants to compare, then the appearance to you becomes the issue. I am the exact opposite of Rex. I dislike how higher k bulbs make my tanks looks and do use the AH Supply ones. I have the 55w 6700 K and like them. But I also use their lower K ones as well in one tank.
I even use some GE Plant & Aquarium Fluor. bulbs which are very low K. They produce light that somewhat looks like tanin staining in the water and I want that in some tanks.
The plants in all my tanks, despite using vastly bifferent bulbs tank to tank, all do fine.