Now that your going into week 5 of flower and the plant is gonna be done growing vertically by now, opening up the temp gap between lights on and lights off will signal more energy to be sent into the budding process and resin production. Veg and early flower while the plant is still growing vertically we want the temp gap tight or it will stretch. That is why we must time it properly. But post weeks 4 to 6 in flower depending on strain we want that gap beyond 10 degree difference between lights on and off.
If you do not have them already get yourself a PAR meter and a thermal temp gun they will really help you get the most potential out of your lights.
Keep up the great work man. If you got a minute check out my 200 light 7,000 plant diary and follow my profile. Happy growing friend. If you ever have any questions do not hesitate to ask.