This might clear some things up............

This months cannabis Culture Magazine has a big article on why MJ dosn't need darkness. and why the ONLY reason to give it to it is to slow growth, or reduce power consumption.

It says that cannabis plants will grow 3/4 as fast with 18/6 than with 24/0
which would make it a linear curve.

I keep my plants on 18/6 because they grow fast enough. and yes they do grow at night. they grow all the time. but many reactions only take place during the light phase (other than photosynthesis).