So What's considered HIGH HUMIDITY??

[NeoNJ]

This time of year in the Northeast is a bit problematic with both Light and Humidity levels. I have acquired a number of Aerangis/Angraecum that are Mounted, and I'm using (2) Humidifiers in my growing area, but I'm trying to get a take on what is considered HIGH HUMIDITY............everything I'm reading says 50% +,
or 50-75%, which is a rather wide variance.

So, what does everyone here consider HIGH HUMIDITY levels ???