Some are, some aren't. I was going by Transcend's web site which says that they are full spectrum: "The fixture emits full-spectrum PAR light for 96,000 hours (10 years of 24/7 use)."

In theory, you can get a significant gain in efficiency by choosing specific wavelengths. In practice, it's difficult figure out exactly what these wavelengths should be, and to match them to existing high efficiency emitters.