Idk if you'd agree to this idea but,
My idea was when Lightbulb got home closed the room and overthinks what she did, crying herself to sleep. She didnt go to school cause she was really really tired, making her friends (which is Test tube, Fan, Paintbrush) really worried especially paintbrush. Paintbrush wondered how is she? Why she didn't come? Like that. They went lightbulb house and saw her just staring at the wall for a straight hour, hugging herself thinking what she did.
So yeah.. I think you have different plans ehayys