The first week of flowering is over. The plants have pulled through as usual. I installed a net for SCROG and trimmed everything under the net - that means the twigs in the lower levels and especially the leaves growing out of the main stem, which didn't get any light anyway. I also changed the lamp from 4200K to 3100K, which has a more suitable spectrum for the flowering stage.
Note: TH-9 was spray applied on the first day of flowering.