4 X MIMOSA X ORANGE PUNCH

Hello grow comrades, I've had a bit of trouble this week, I think the bulb were too close to the plants. So I hung the lamp higher. Furthermore, I measure the waste water and these values ​​are "EC 1.8" and that's good, because according to the schematic it should also be 1.8, but the PH comes out at 6.6PH. I acidify the water at 5.8PH. Should I take it even lower ? or do i leave it like that ? ✋