Flowering problems

I have 4 auto-flower plants, 6 weeks.
Now 2 of them is flowering. but I got this situation:
I have 1 grow tents for them, could only be used during nights.
So I got 2 way to help them flower better.

===ONE====
12 hr light at night.
12 hr in darkness at daytime.
with low temperature gap, about 35C daytime and 30 at night,
but 300W LED light

===TWO===
12 hr light at daytime with natural light
12 hr in darkness at night
that means I will no longer put them in the tents
I can just put them behind windows with natural light, and the light is not so strong.
but temperature gap is higher, about 10C.

which way should I choose?

PS:These are pics of my girls:>

Their auto's!

No need to reduce lighting times! They would flower just same at 24 hrs of lights on.....

Auto tricks?

Deep pots, as deep as you can get them. Not big around but, tall/deep. It helps the yield.
Run them 18/6 all the way, or even longer if you like...

They tend to be fussier then photo's - so less feeding and adjust up if need be.

as long as their autos it really doesnt matter how much light they get from what i hear you can run a light on them 24/7 but i havent tried it their pretty hard to stress out