Yeah all the above applies to both auto's and photo period's.
And yes a humidifier is a great tool to have and use,young plants love
High humidity-70% humidity is your target for best growing environment
Although you will be ok 50 and above.so don't worry too much if it's at that.
But higher is better.
And remember it's 40-60 in flower but you want it at the lower end of that
To be on the safer side of not getting bud rot/mould.
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