Aqua Man
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The reason you are seeing a spike in humidity with the lights off is the temperature change. Ergo relative humidity. Find a way to keep temps similar and this spike will go away. Going to 24 hrs light will fix the issue but the funny part about that is the plants will actually transpire more. Giving off more water vapor but because the temp stays the same the humidity issue will be corrected. If you run the same day/night temps you will eliminate this all together. So using a heater during light off may be a good option.
I use a programmable controller for my heater and used to drop temps by 2f every 30 min at lights out to allow my dehuey to keep up as it was small. The controller is plug and play and costs like 40-50 US.
I now have a bigger dehuey so it's not an issue but thats the cheap way to do it in some cases it's just cheaper to control the temps if your lights on humidity is in a good range. A dehumidifier would be a good investment if you struggle with overall humidity issues. But if it's just night humidity temp adjustment is often a better option
I use a programmable controller for my heater and used to drop temps by 2f every 30 min at lights out to allow my dehuey to keep up as it was small. The controller is plug and play and costs like 40-50 US.
I now have a bigger dehuey so it's not an issue but thats the cheap way to do it in some cases it's just cheaper to control the temps if your lights on humidity is in a good range. A dehumidifier would be a good investment if you struggle with overall humidity issues. But if it's just night humidity temp adjustment is often a better option