My Cree wifi bulb is only controlled by/through the Wink Hub.
You mean you can't control the Cree with Alexa?
Alexa
does recognize and can control Cree WiFi bulbs. No Hubs or other devices are required to turn the Cree bulbs ON or OFF via a voice command. But that is it... no other control (that I am aware of yet). I also wanted to mention... the Cree bulbs also have local control. So... if [I am] still to sleepy to remember to tell Alexa to turn on my lamp..... turning the switch will work fine too. Then later I can instruct Alexa to turn the light OFF.
But, Apples home app (comes with the Apple phone), or the ihome app, or MyQ app can't "see" (or control) the Cree bulbs.
However.... the Wink Hub "sees" and controls the bulbs... including a dim/bright function... and can also incorporate the Cree Bulbs into schedules, and robot activities (macros). The benefit of the Hubs (as I see it... at this point) is
integrating the various flavors and brands so as they work together. As well as the limited robot/macro functions. (X10's macro function is far superior).
As an example... My MyQ garage door opener works fine with it's MyQ phone app... all my itself. But is not seen by Alexa. But when incorporated with my Wink hub... can do so much more.... like turn ON a mix of (different brand/flavors) lighting products. And/or send email/alerts directly on my (and my wife's) phones (a function from the MyQ app).