hey agent86
i think you're making things harder than they really are.
it can be a little confusing...especially when you really look at some of the details...but if you just forget about everything else and start over...
1 foot-candle is the same brightness as 1 lumen per square foot.
so if you measure 57,000 ft-candles, that's the same as 57,000 lumens per square foot. whether you're 1 inch away or 1 foot away or 1 millimeter away.
now if your lamp actually illuminates the entire 1 square foot area with the same 57,000 foot-candles (57,000 lumens per square foot), is another story. i think that's your question? |