Originally Posted by papalobster
I don't recall ever seeing a lightbulb. Hmm.....
It will also appear in the bottom left corner where it shows you tank damage - a little lightbulb lights - you can see it grey'd out when you don't have it
I personally find it very useful no matter the tank - because if I'm being harassed by artillery it lets me know when I'm clear to come out of cover and make a move.