m0useanswered grow question a year ago I agree, makes the night longer for one cycle to accommodate the new schedule. so 5pm off, 9am on.16hr off vs 12hr off.
A lot of hydro companies change rates a few times in the year so this is required to keep the bill low.
I know of a few people who have the lights on at night and off during the day. Helps control temps more and lowers hydro cost for the entire grow :D
Good Luck!