A little growing trick
This is a trick that every true breeder in Amsterdam knows, but that is rarely or almost never available on internet. Its purpose is to accellerate the plant methabolism to pass from the vegetative phase to the flowering phase. This result can be simply reached giving the plants 24-36 hours of dark in the moment that you are switching the timer from 18 to 12 hours of light a day. So, if you are, for example givin light from 9.00 am (sunday) till 3.00 am of the following day (monday), you can keep, only once, the lights off till tuesday morning or afternoon. Then go on with a normal 12 hours of light and 12 of dark. This simple trick reduce the flowering period of a few days (this depends by the strain, sometimeyou can save up to a full week of flowering). The plant have more time to develop the buds, and that will result in a bigger yield (10-20%). Really not bad for a simple trick that cost nothing, zero money, zero energy, zero time. You even save a few euro/dollars in the electric bill. What do you want more?
Just a little suggestion: don’t do it with plants from seeds that are less than 3 weeks old. Don’t do it with clones that are not perfectly rooted into their medium. The risk in both cases is to get midget plants, and a very insignificant harvest.