What is this on a Pendolino?

[Bletchleyite]

Intrigued as to what the pictured sensor is - there seems to be one in every coach on the Pendolino. Are they light level sensors? If so how do they differentiate between internal and external lighting?

Thanks.

(Picture is an odd round sensor mounted in this case on the end of the pantograph well of Coach U, but they are on coach ends in other coaches)

 

[Gflynorw]

You're correct they're a light sensor, supposed to make the lights more ambient...

 

[danbarjon]

You're correct they're a light sensor, supposed to make the lights more ambient...

I wish LNER could take note and dim their lights...

 

[dk1]

I wish LNER could take note and dim their lights...

I don’t think that is permitted in newer rolling stock. It all has to meet latest standards.

 

[Bletchleyite]

I don’t think that is permitted in newer rolling stock. It all has to meet latest standards.

Class 720 have automatic dimming lights, as do 777s (though on the latter it doesn't work very well).

 

[dk1]

Class 720 have automatic dimming lights, as do 777s (though on the latter it doesn't work very well).

Drivers can put the 745/755 fleet on half lights but not when in passenger service.

 

[skyhigh]

Class 720 have automatic dimming lights, as do 777s (though on the latter it doesn't work very well).

And 19x/331s.

 

[driver9000]

I don’t think that is permitted in newer rolling stock. It all has to meet latest standards.

397s have adaptive saloon lighting and I'm pretty sure it's a new feature on refurbished Pendolinos.