Lyric discussion by homesickforspace 

Cover art for She Ionizes and Atomizes lyrics by Modest Mouse

"he realizes and itemizes pulls harder than gravity"

he knows she's somewhat untouchable for the moment and he's "itemizing" i.e. getting his priorities in order. obviously she comes in high on the list since he's pulling harder than gravity.

"flourescent lightbulbs will make and absense of dark, but the light just aint there still and she said 'i'm feeling empty, the real lights can make you heavy but never ever really empty flourescent lights will always equal empty.' "

that's talking about no matter how many lightbulbs you have, artificial light is not even half as good or wanted or needed as actual sunlight.