I do have my plants packed fairly tightly under my T5 light. The RH near my plants is currently 43%, five feet away the RH is 37%. The RH outside my room is around 20% to 30%. I have a nepenthes (tropical pitcher plant) and they usually like very high humidity and cooler temperatures than I have. I've had it for quite a while and I saw it adapt over time. It made leaves that were waxier and a little thicker so the Paph. sanderianum may adapt too.