So i ended up extending their dark period from 12 hours to 18hours, to counteract the blunder of leaving the lights on all night. What i should have done is turned the lights off as soon as i'd noticed the mistake and kept them in the dark until the lights were due to come on the following day. But we'll see what the outcome is. At least i know for next time.
A while back i bought a Phillips LED lamp that produced light in the far-red spectrum only (740nm specifically).
What i plan to do with this, is radiate the plants right at the beginning of lights out for 15 minutes with this 740nm lamp. 15 minutes is more than enough, you only really need to expose plants to this kind of light for a few seconds at the start of lights out.
If you would like to know more about why i use this technique, have a read about the Phytochrome (Pr, Pfr)
Phytochrome - Wikipedia, the free encyclopedia
Essentially, by radiating your plants with far-red light in the absence of Deep red light (660ish nm), you are "theoretically" able to reduce your dark period by 2 hours, which means i can add this additional 2 hours of light to the day period, to give me 14/10 (day/night). But this can only be done after your plants have switched over to flowering (this happens after 5 night of 12 hours of darkness consecutively).
Here are some pictures of the lamp and how they look in the tent
The lamp, when it is off
The lamp when it is on
The lamp in the tent when the lights are out