Too low, should be around 60% at 84°F! Below is a chart about VPD at different temps. It already factors in 2° lower leaf temperatures against ambient, as usual with LEDs. You can use it like it is!
If the vapor pressure difference inside the leafes is too high your plants transpire much more water, more water uptake means also more nutrient uptake, especially calcium and too much Ca blocks other elements like Magnesium, Iron and others. The results can look like a Mg deficit but you also see other signs of nutrient stress like purple veins, chlorosis and so on.
To avoid issues you can either use less nutes(25% too high VPD = 25% less nutrient strength) or you increase you humidity according to the list below.
I would use an IR thermometer to messure the leaf temps. Messsuring at ~20cm distance to the canopy should give you almost correct values you can work with. Usually the leaf temps are 2-4° lower than ambient temps with LED (blurple a bit more, with whites a bit less).
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