Certainly not affordable to the everyday reefer. At least not the ones that seem to grow coral well.
I love my DIY LED actinics, but I pieced mine together with parts straight from Hong Kong, not the CREE panels everyone else loves. But I also spent significantly less.
I just paired my cheap but bright LED actinics with my MH (cheapo PlusRite bulbs there too), and I love the color I get.
You cant beat LED actinic pop, even my VHO can't touch the colors I get now. I'm not however replacing my MH anytime soon, even though I could DIY on the cheap.