I always use normal warm and cool T-8 or T-12 bulbs since they are pretty much the cheapest you can find when you're using a fluorescent fixture. You don't need a ton of light before the seeds have germinated, but there isn't as high of a germination rate for me if I have very minimal lighting.
When they start germinating, you'll want them to be closer to the lights for the fastest growth- depending on the lights you use, maybe around 6 inches away will be good - just make sure they don't burn up.
Then when you feed the seedlings, they will be able to grow faster since they will be able to synthesize more sugars through photosynthesis.
When adult size, you shouldn't be afraid about putting them within 2-3 inches of fluorescent lights. I know I was worried at first, but sundews can use a ton of light. I've been reminded several times by experienced growers that "light intensity works by inverse square relationship" so the further away you have the lights, you will be losing more light intensity than you might expect.