So you changed the lights on 1 Oct? Give them 10 days for flowering to begin that puts you at 6 weeks. You have around two weeks left @Whitewidownoobie but it could be longer.
Do you have a Jewelers loupe or a heavy duty magnifier? You will need to look at the trichomes to determine when they are ready.
Also a pic of you plants would be good to see as well.