P-51 cockpit doubt

[Jenisch]

I marked a component which I don't know the purpose...

 

[FLYBOYJ]

I believe its a light.

 

[Procrastintor]

lol, "THAT sunny, is one-a them "lights".

I just checked an old flight manual, flyboy is right. Anyway, that was the quickest answered question I've seen on the forum.