Technically, 1 lumen equals 1 foot candle at a distance of 1 foot from the light source (not square foot) It actually radiates in all directions (not blocked by a reflector.) Light does not fall off in a linear pattern however, so you can't simply divide by 2 for 24" - I don't recall the exact relationship. My original calcs were for "candle power", not "foot candles", sorry.
Kris that is a viv to be envied for sure [not to mention the pics are still in the post which is good ].
Did some of those cork pieces already have plants growing on them?.. that's what it looked like in the photos..
Could you post an update pic on the viv? I would love to see how it has grown in Also how is the Dracula lotax going- did it handle the heat of the viv?