It runs off one plug. I do believe you can buy the dimmer separate, but I would say to check the website to be sure. Both pairs of the ecoxotic lights all dim and I have dimmers for all.
Upgraded my lights on all of my tanks. So I am selling these. Everything for $200. Cant beat this deal! PM is interested.
Rapid Onyx LED Non Dimmable
Ecoxotic Pro Module Blue/Magenta (2)
Ecoxotic Stunner Strip (2)
Ecoxotic Inline Dimmer (4)