Quoted from MikeO:The caps say "When Lit" to distinguish that the noted score will not be received should the score motor be executing another different function. The cap will go dark when this is happening.
Kind of a truth in advertising thing.
This. Indeed most times it is for pop bumpers that are lit by completing or doing something, but sometimes they literally only say that so you don't complain that you don't get something when the score motor is running, but otherwise they are always lit. Very literal!
