I have been running full spectrum lighting in Sassy's mew for about a month. Today I found her first molted feather. This looks like a #10 primary, on the right. That would be a normal first feather to fall. I would like her to move through the molt and be ready to go when the season opens this next fall. She has been her normal, cranky off-season self. I've also been helping her build up a nest . . . with me doing most of the work. I wonder if she'll lay an egg. I'll only check when I have food to distract her.
(BTW . . . this picture taken after I got home from a 12-hour shift, and a fairly busy one at that. I look tired!)
(Three days later, I found the matching #10 primary, on the left.)