Jungle's 2nd Grow

[Jungle]

Anyone wanna weigh in on nighttime VPD?

How to control VPD while lights are off?

So, I find my self wondering what to do about VPD when lights are off (like OP). After a bit of instrumentation and about 3 days of data collection, here’s what my tent looks like: [VPD Chart] I’m trying to keep my VPD (the green line) in between 1.2 and 1.5 kPa (indicated with the straight black lines). A moving average of VPD is shown as the black wiggly line, which is mostly in-range except overnight (when VPD drops down to ~0.6kPa). Does anyone have any idea whether the nighttime VPD h…

Chart for attention (chart also at linked post)