Environmental controllers

[4maggio]

I'm at 22 days bloom at my current grow (Original Family Big Buddha Cheese) but this isn't about that.
This will be y second grow featuring a 400w LED in a 2x4 tent. The first run was just keeping it at 85F/60%rh, period.
This run, currently 22 days into bloom is also featuring for the first time an environmental controller, in my case AC Infinity just because, by happenstance, I had a couple fans by them on hand already. I've become more aware of VPD and the control humidity has on it.
I've been pushing, pulling, adjusting adding and subtracting trying to get the VPD number I want during veg and now bloom.
But how does one know if those temps and rh%s are correct? Although they have been growing nicely.

Today, I concluded, and made a unilateral decision with myself, to use the mercury filled thermometer and mechanical humidity dial as the baseline for temp and RH in the controller. Adjust them both up or down to match the analog/mechanical devise.
Anyone have a better way? If there is one please let me know. My infrared thermometer is ok with analog temperature too.

I've had some great runs with HID and 79F/60%-45%RH.. but this plant, at this point in time, is the best looking girl I've ever run.
Every leaf is 'perfect' I'd put up a pic or two but I suk at photography and the deep green leaves look nothing like the pics I took and that I don't know how to get from my phone to here anyway.

 

[4maggio]

Why can I only see this if I 'search' "controllers"?

 

[Rocket Soul]

Its easy to get lost chasing decimals of vpd. I argue for more following it more loosely and focus on just looking at the plant and what its doing. Youre not after following vpd just cause people online say you should do it; youre after the plants response to correct vpd: transpiration. Are all leaves erect with leaf boners? Your in good range. Is the plant with saggy posture and ppots take time before dry? Look up your vpd values, adjust towards them, and read your plants again

If can see how hard you infinity run your extraction on your controller or just measure the tine between rev up and down while the fan is on setting for controlling rh: the harder it has to work, the shorter the rev down cycles, the more humidity your fan is having to remove; the more the plant is transpiring. VPD is not something your following for its own purpose, you do it so that the plant sucks watter as much as it can, a great correlate to good plant performance. When you feel youre getting it just right: raise light intensity and nutes in middcycle 3-4 week, usually here, when nicely dialed in, the plant can take tremendous almost infinite light as long as your spectrum is not deficient.