Dimmable dimmable dimmable! Lol
I recently upgraded from dual T5HO to LED
and have been running them at 25% white/35% blue because any higher and my soft corals looked shriveled.
One thing to remember with LEDs is that they penetrate water better than fluorescent so more of the light output is directed down. Same number of watts means more wattage directed at the corals. I'll be turning them up slowly as things get acclimated. But they are SO worth it. Beautiful colors, great light, and low power consumption.