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.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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