sweet mix auto in mini grow led

Hi everyone, the plants are doing well overall, the C has a high N I think, I don't know if it's hungry, I know if there's some problem with the PH. The ph meter should arrive soon. in the meantime I started to integrate calmg. plant B has yellow leaf tips, could it be calcium deficiency or too close to the LEDs? I tried to check the LEDs, I don't have a calibrated instrument, but as I suspected the left lamp performs less, they are 2 slightly different models and the less performing one has already worked 6 cycles in a few days I should start the next cycle, this time only 2 autoflowering plants from Fast Bud, it will be my first experience with their seeds