Lunar and Solar peak don't work properly. When at 100 Lunar energy you may get Lunar peak, however when at 100 Solar energy, you may also get Lunar peak - same case with 100 Solar energy.
When in combination with Astral Communion everything just gets more crazy. Sometimes when at 100 Lunar Energy or Solar energy you don't get either Lunar or solar peak.
Basically, I recommend you have a better look at it as it's not doing what it should do. At first it may look like it works but when you play with it (get crazy with it) it's just a mess.
Also, I can't relate to the description from wowhead to the actual game.