Question about Corsair Sp120 RGB

It is not dimmable.
You need the controller Corsair Fan LED Hub, without it you have no possibility to adjust the colours, change the mode or the speed of the colours. There is a mode that alternately dims the colours down and dims them up again. However, you cannot fix the dimming.

Needs a controller! Should be used with Corsair SP120 RGB with controller (120mm, 3x) or with controller (120mm, 1x).
Controllers are possible up to 6 fans...
3-button controller with convenient lighting effects,effect speeds and colours.Four hub mounted RGB LEDs and translucent fan blades with frosted texture create bold lighting with vibrant lighting effects.
Dimmable actually not just colour a little stronger or weaker.... but has cool settings like sleep all colours changing, flashing etc....