That actually seams like a great idea of getting more life out of the bulbs since the color shifts to yellow and the corals don’t really care about what we see , just what they need.I don’t know about the 6500k from Hamilton but I know a guy local to me that runs the 10k on his tank then after 18 months he switches those bulbs over to his grow out tanks and puts new bulbs on the display...his corals in the grow out tanks grow great!
Corey