And sorry, I got tied up on a few things. You can top after the 4th set or any after that.
We should probably do some calculations. You are going to run out of height most likely. Measure from the ground to the very top of the plants and let me know
Then measure from the top of the plants to the lights. Then how much more can you raise your lights?
Remind me how many lights and the kind and wattage? @jmlove123