What affect would increasing photoperiod at the end of flowering have?

so ive harvested 5 of my 6 plants, the last one looks about a week away from ready. the problem is that my next batch of seedlings need to go under the hid now. what effect would increasing the photoperiod this late in flowering? will the plant still ripen?

Hmm well yes but no. It will continue to change trichome profile but start foxtailing n revegging in 2 -4 weeks causing less eye appealing feral buds. 6 - 8 weeks of this change can ruin structure and or hermie buds depending on how drastically light change was