I've been very pleased with switching to T5HO lights. I was initially worried about burning my plants, but have found that most healthy adult Nepenthes can grow quite close to the bulbs with minimal strain. I was also surprised to see that even plants on the edges of the light cast by my fixtures seem to get along quite well.
I'm trying to get more bang for my buck out of my lighting setup these days though, so I was hoping to consult some other T5HO growers about the geometry of their setups. How far away can you move your plants from the fixtures before you start to see signs of insufficient light? Most of mine are eight to thirty inches from the lights, depending on height, but even the vines that have grown clear off to the sides of my racks seem to do OK with little to no direct light to their tips, which leads me to believe that I could light a much larger space with clever placement of my lamps.
Pics, measurements, anecdotal evidence or academic papers are all welcome and would be a great help in my deciding how to proceed. Thanks!