yes, thats true. Well, the part that some people do it. As for wether or not it works, ive seen the opposite of what its supposed to do in that theory. I've done plenty of experiments with it. All that will happen is your plants wont have 12 hrs worth of energy each day it could of put toward starting to go into flowering. The cannabis hormone that triggers flowering is destroyed by light, when you go to flowering in 12/12 enough of it builds up to trigger the flowering process but heres the thing, It triggers flowering, it doesnt control how fast it goes. adding more than the needed amount to trigger flower is pointless.