I had something interesting happen and I was wondering if anyone has had a similar experience. I have a couple of N. rafflesianas growing in the basement outside of the tanks, and when one of them got a little dry, the leaves closest to the lights promptly yellowed and started showing the typical spotting that occurs when the plants are burned by high light levels. They were perfectly green before, and the rest of the leaves weren't affected at all. It is growing beside a bank of eight spiral 23-watt fluorescent bulbs, and do they put out a lot of light. I just thought it was interesting that the plant didn't show any spotting until it got stressed.
I've really been surprised by the resiliency of N. rafflesianas. I had to move mine out of the tanks when they got too big, and they seem to be able to cope pretty well with various stresses, including low humidity. The plant is still growing just fine and the pitchers on the burned leaves weren't affected at all.