Yes but outdoor and indoor is different. The truth is it probably doesnt matter much.. the reality is if your setup is good it wont matter but for many it does matter.. at light off is usually when you get a humidity spike from lower temp.. watering just before light out can just increase that problem.. also your plant doesnt do much during light off so why would you want to feed her then? Might as well water when light turn on so she can use the water/nutes while lights are on.. that would be my best bet as to why