i left mine sit on my kitchen table, we have a large window with south exposure and the sun never really hit my plants unless i put them on the floor where sunlight was shining in and mine did alright.
they grow like a large cane plant anyways, it would be hard to tell if the plants where growing lanky or just growing in its natural pattern. if i remember correctly, this would have been one of my tallest growing peppers.
good luck.