I Knew you were going to ask me this
This is from my experience and you have had really good advice from other people that have a lot more experience than me with these plants. I do have a few nepenthes that I grow under these lights. The reason is that it gets well into the hundreds during the summer with very low humidity and I don't have the means to provide the proper conditions for them to get natural light. If I could I would. So, yes I do use these with my nepenthes. There are a select few that seem to grow ok with them and then I have others that seem like they don't want to do anything. All of which are growing slowly and don't color up as nicely as I think they are able to. I also have a humidifier running constantly in the room I have my nepenthes growing in.
I have a small covered aquarium that I have created a false bottom and then covered the bottom with live sphagnum in a west facing window. I have three bicals in this aquarium getting full sun for, at least, 4 hours a day. It also gets extremely warm inside but since the humidity is high the plants do ok. These three plants are growing far better than my other plants. I use an aquarium with these three because they are the only ones I know for sure that like it hot and humid. And when I mean hot, it's around 100f. These three push out a new leaf every week and pitcher. The pitcher take longer to mature and open, but they are doing much better than the ones under the lights.
I'm playing with the idea of buy more expensive bulbs meant for salt water aquariums that have a higher color temp and see how these work. If I could afford a climate controlled green house I'd be growing them in full sun.
I hope this helps.