Converting F- stop and Exposure to Lumens or Footcandles?

I have a digital camera, and I’m trying to figure out the number of lumens falling on a given area. I’m taking a light reading on a 12″ by 12″ square of white paper at iso 100, I get 1/160 at f2.8 anybody have any idea how to figure out the lumber of lumen or foot-candles? even calculating lux this way would be helpfull.

You should have enough information to do this. I would suggest calculating the Exposure Value you have using:

http://en.wikipedia.org/wiki/Exposure_value

which is about 10.5 Ev for your case. This looks to be about 200ish cd/m^2, assuming certain calibration coefficients. That wikipedia page has more information.

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