Yes. It's a bit hard to get it right since Nepenthes are rather
large plants and brightness decreases dramatically as the distance
between the source and receiving surface increase. So you can
have a plant getting to much light at the top and smaller plants
or basal growth that gets to little light. Nepenthes do have more
range in the levels of light which they can use. Other CP like
Sarracenia, Heliamphora and most Drosera which just want as much
light as possible => full sun at least most of the day. Nepenthes
can use lower levels of light than want they really without getting
sick, so that helps counter the problam caused by their height.
Basically, somewhere around 75-80% sun is top limit on what they
can handle for 13 hours/day. Though they can made do with less
you might grow more fungus than Nepenthes with light levels
around 50% or less...
Dave Evans