Roger,
Your LED information in 100% correct. Not that I was doubting you, but I wanted to provide some additional feedback.
The coral I got that was very dark purple and green, has now, just 24 hours later, turned a lighter green and purple.
I'm convinced and I'm looking to add T5 lights to my tank. I'll start another thread to get recommendations on which light to use, but wanted to share.
I'm converted.