Switching light times 12 hours... is it possible?

Ive got my lights in flower going 9 am - 9 pm... is there any way I could switch the lights so they do the opposite? Turn on at 9PM and turn off at 9am? I'm in week 3 and trying to deal with the daytime heat.

Yep its fine just switch it up leave ur lights off when there supposed to turn on at 9 and turn them back on when its 9 pm

Give extended dark to come to your 'on' time, not extended light.
You will be fine.
That's what I did was run lights during night over the winter to help heat at night.

Yup I JUST did this about a week ago. Just give em 24 hrs in the dark you will be fine....My plants seemed to like the extended dark period honestly