There's an on/off switch on the base and the water valve acts as a dimmer (that was a bit of pain to figure out how to do!). Technically since the bulb can be controlled via a phone app (and it's a blue tooth speaker), it really doesn't need a dimmer. I just thought it would be cool and a great excuse to pick up a few rotary switches. Amazon can be a very "bad" thing.
If you try this project please read up on switches and good safety steps in building something that mixed electricity with iron pipes.
I doubt I'll wrap this present but I'll think he'll like it.