Delayed timing cycle.

I turn my lights on at 22.00 and turn them off at 18.00.

So my plants get 20/4 light schedule.

At the moment they are young just shooting there 2nd set of leaves.

About 15days old.

But last night the lights didnt come on until. 02.00.Thats 4 hours late.

Anyone have any ideas of how this will effect them and what cycles i should use now.

I was going to turn them off an 20.00 tonight and back on at 22.00

Just go back to your regular cycle. In nature a rain storm can blow in and curtail the amount of light plants get. Then the next day It can return to normal. This doesn't do anything to plants. So what happened to you will be very similar. If you go back to your regular cycle it should have no consequence.