A temporary light intrusion should not be different than an extended light cycle. The plant can pump the photosynthates it makes in the day period--it does not need dark to do that. The only purpose of a dark cycle should be to signal for flowering. I don't think GreenDestiny completely understands how plants make, store, and transfer energy. In fact, I am pretty sure we could do something like keeping blue light on the plant all the time--it is far outside the range (red and far red) that have an effect on converting the two forms of phytochrome (a cis/trans thing) back and forth. I am going to consult my plant physiolgy book over the next few days while studying for finals and see if I can find out more information on this. I consulted with a professor at my university (a physiologist) who says that flowering should not be able to be stopped once in progress regaurdless of the light cycle. I'll be posting a more in depth reason for this and possibly a better hypothesis to test.