Is it best to move plants at day or night?

Probably a dumb question, but I bought a bigger grow tent and was wondering is it best to move my plants during the day when the lights are supposed to be on and let them go a couple minutes without light, or at night when the lights are off. I'm in week 5, All autos. I know they are not supposed to get light at night but unsure at what stage that is. Truthfully it's my first grow and I've been exposing them to light ( from my bedroom bulb) almost everyday and I have a humidifier in the tent with a little green light on it. So I am happy to see so far they are all females. So what time of day is best to move them? Thanks in advance!!
 
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