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No way can I keep the VPD in range with the lights out. Humidity always goes up and I try and limit it to 80%. Always have some air circulating. But the weather isn't cooperating and the humidity is mid 70%s in the house. Best I can do is control the temp then. I limit to 83F or so and the VPD drops to the 1.15-1.30 range, dryer is better. But I have to add a mister humidifier about half way through the day.
Lowest humidity I've eve seen in the house is in the low 40% range and that would be in the winter with the heat on and very cold outside.
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