That was just a generic picture of a power supply to an LED light.
I used it as an example to figure out if your light uses that 12v plug in adapter.
MML has the following options as dimmers for you to choose.
https://makemyled.com/mml-touch-dimmer/ - $8
A simple on/off switch that includes a dimmer from 5% - 100%.
https://makemyled.com/rotary-dimmer-mml-rotary-dimmer/ - $19 ($30 includes wiring)
This is a rotary dimmer that is a capable of controlling several lights with one dimmer.
https://makemyled.com/smartphone-wifi-controller-mml-wifi-dimmer/ - $37
This one is wifi controllable on an iOS or Android phone for up to 5 lights, with auto on/off.
https://makemyled.com/auto-controller-mml-auto-dimmer/ - $72
This one is the big daddy that does it all. Auto on/off, dims, programmable sunrise, sunsets and moonlights for up to 5 lights.
Talk to the guys at MML. they can give you more info.