Can you qualify/quantify this? Or is this just a personal preference?
Again, are you positive it was the lighting that gave you the growth? How are you certain it wasn't nutrients, or biome, or any number of other things that we have going on in our tanks? Why are you specifically attributing the growth to the lights?
I'm not trying to be combative, I am genuinely curious... My AP9X was the light that did it for me, everything just started looking better, it's kind of hard to describe honestly, polyps extending more, color becoming more vibrant, growth exploding, etc. But, some of that may have had to do with also starting a refugium around the same time...
54cm (or up to 60cm as op recently posted) is only 21-24 Inches... Not 30...
Edit: Wait, are you talking front to back and not top to bottom? This may be where the mixup is