Unknown LED on Dashboard

[FordToMerc]

Could someone please advise me what this LED is for.
I removed the cover next to the display to reveal the LED. There is a hole in the cover so the light can shine through, but have never seen it on.
2012 C-Class C180 W204 1.6litre Petrol.

 

[whitenemesis]

Is it an LED or sensor for cabin ambient light level?

 

[FordToMerc]

Unknown LED on Dashboard is a SENSOR!

Yes! Thank-you!
It is a sensor as you suggested.
I shone a torch directly at it and the display went brighter. Not that I doubted you!
:bannana: