In the fall, mine lose so many feathers that they have huge bare spots, and look like they've been in an explosion, but without the burns and injuries. When the feathers start to regrow, they sort of look like porcupines for awhile. That's what I call a full molt.
In the spring, they just seem to shed some winter feathers, egg production drops slightly, then they're all back to normal again. That's a light molt.
Right now, I have maybe 6 who look raggedy, with some bare spots, but they're still laying pretty well. I have increased the protein and made some other diet changes, that may be why I'm still getting lots of eggs.