How to switch light times

Currently running my lights from 8am till 8pm and I wanna switch so lights are on at night instead of daytime. Will it screw up my flowing cycle??

Probably not if you do it gently ( back wards would probably be better since they’ll just lose 1 hour of rest a day) starting 7 to 7 then 6 to 6 etc

I just do it. Leave them in a really long dark period, until the correct light cycle is on, they’ll adjust.

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what covert says, its the dark cycle you want, just make sure they get the 12 or more hours of darkness