Originally Posted by
gardro
You want higher VPD when you enter flower in the 1-1.5 range. 0.8 is far to weak a deficit.
Most of the charts and calculators suggest having RH a little too high for us percy growers in smaller tents so you will see a lot of folk in the 1.5-2.0 range or possibly higher. Its not ideal but it does remove budrot anxiety.
Ideal is around 25°C at 55-65RH
Type of lamp is important as leaf temperature is different based on radiant heat.
If you run lower VPD, eg a cooler/ damp room, you should feed higher EC but still can get deficiency (calcium usually)
High VPD, hotter / dryer, you should feed weaker EC unless you want burns
Fair to say you need a decent environment controller as the ideal range is quite tight.
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