One time, I was trying to find some kind of equivalent. The best I could do was I took a candle into a walk-in closet (the only room I have without any windows) and took a picture of the room when it was only lit by that candle. I then recreated the room in poser and used one point light for the light of the candle. I then did several test renders to see what kind of intensity it took to match what was shown in the picture. With the attenuation set at inverse square, I found that 0.5% was very close to the picture. So simply a poser light at .5% is one candle power. The formula I found for converting to lumens is L=C/0.07958 so you might be able to go from there to find how you want to set your lights.

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