We replaced our lights from a T5 to HPS and we've had major alterations with our ph and ppm. With the T5 the ph and ppm remained consistant. We would go for days with the same ph and the ppm alternating at the 1320-1290 range throughout the day. Since the exchange of light to HPS, we are adjusting ph two to three times a day to lower it to the 5.2-6 level. Our water is being absorbed more rapidly due to the heat. Because these issues didn't exist before, we are pretty sure it is the light exchange. Plant remains healthy due to our constant adjustments. In our budding cycle. Anyone got any other ideas??? Is it normal for a plant to be this high maintenance with HPS?

Some info: Use Ebb and flow with Flora/Micro, Gro, and Bloom (10 gal)
change water every Sunday.
400 watt HPS light
hippieshaven Reviewed by hippieshaven on . HPS Lights adjusting Ph???? We replaced our lights from a T5 to HPS and we've had major alterations with our ph and ppm. With the T5 the ph and ppm remained consistant. We would go for days with the same ph and the ppm alternating at the 1320-1290 range throughout the day. Since the exchange of light to HPS, we are adjusting ph two to three times a day to lower it to the 5.2-6 level. Our water is being absorbed more rapidly due to the heat. Because these issues didn't exist before, we are pretty sure it is the light Rating: 5