I've used a Coralife PC Quad 96w 6700K, once, exclusively on a 10 gallon HC iwagumi tank for about 6 months. The HC grew well but kind of vertically. With that much watts per gallon, you would think it would grow horizontally.
I just changed my light fixture about two weeks ago to 2 NOVA dual 20w HO T5 using all 10000K bulbs. Less watts per gallon then before. Also I had killed all my HC due to a blackout due to a fight with green water so, I replanted brand new HC. Within two weeks my HC is growing faster and horizontally.
I now thinking about adding 10000K bulbs to my other tanks.
We don't control the "System".
The "System" controls us all.