Ahh, true, but then T5s do have a tiny UV output. Personally I don't think that is the primary issue, but I do think it is a sub-text to the issue of spectrum. LED manufacturers love to show nice smooth colorful curves representing the spectrum of their "white" LEDs, but the truth is if they used expensive equipment that measured each individual wavelength the spectral plot would appear digital with lots of spikes and lots of gaps.
Bottom Line: For me, results matter. Here's a one year progression of my reef under MH and T5. I lost some colonies and rearranged several colonies, but there are enough colonies that stayed put to be a good example of how effective MH and T5 are at growing colorful coral. I would note the GARF Bonsai, the purple humilis, Blue Stag, Purple Slimer, a. Microlados, and others all of which show awesome color and growth.
I think the best is the purple humilis. You see a tiny colony in the top right in the first photo and a year later it's a beautiful purple colony with perfect growth form.