In general plants tend to produce larger/longer leaves under lower
light conditions, perhaps to get more surface area for photocsynthesis.
However some CP growers have begun to assert that Nepenthes
actually pitcher up better in slightly lower light, and that they
color up better in lower light. This assertion is from people who've
visited Nepenthes growing in nature and observing the growth habits.
Supposition is that the plants produce more colorful and numerous
traps in darker areas, since the plant has to rely more on eating bugs
when it can't photocsynthesize as well.
Regards,
Robert