Yikes..

What strain are you growing?

are you running a 24 hour on light schedule? And the light was left off for 6 hours to an 18 hour on schedule? Well thats fine most people usually run a 18 hour on schedule anyways so that's no problem I assume you could just stick with it on 18 hours instead if you like but not necessary. You should be fine either way as one small break in the light cycle usually won't have any bad consequences.

Originally Posted by Pipe Dream

are you running a 24 hour on light schedule? And the light was left off for 6 hours to an 18 hour on schedule? Well thats fine most people usually run a 18 hour on schedule anyways so that's no problem I assume you could just stick with it on 18 hours instead if you like but not necessary. You should be fine either way as one small break in the light cycle usually won't have any bad consequences.

Unless he is growing an auto strain. The stress caused by that large of a change in lighting can easily start a irreversible budding regardless of the future lighting cycle. Autos can be a pain in the butt. Some auto crosses also start budding after very little stress. Once they start they don't usually stop no matter what you do.