T8 Arcadia lighting control panel

[Godzilla 84]

What does the little white dial do on it. I can not find any info anywhere?
This is for the uvb lighting control panel

Many thanks

 

[Sadie]

What does the little white dial do on it. I can not find any info anywhere?
This is for the uvb lighting control panel

Many thanks

I don't know anything about control panels but I might know someone who does

 

[Sadie]

I don't know anything about control panels but I might know someone who does

Here is the response I got
I think they mean the white piece on the T8 UK controller. Arcadia T8 Controller with Plug & Socket Lamp Leads (IP67)
I'm not actually sure what that does. I haven't seen one in person and can't seem to find a user guide.