I don't think it will make much difference unless you have other underlying stress issues with your plants. Provided they are healthy well cared for plants, an hour shift shouldn't be an issue. In my particular case, it's pretty important to have the cycle start at 7 p.m. and off at 7 a.m., so the adjustment at time change is pretty important and seems to have no ill effect. Just sayin..
mgk
i didnt shift any start times, it all starts and stops at the same time as it did before. i just made it so the time of day was consistent w our day light savings time.
muddywaters- lookng good. they are filling in nicely.