I really need someone who has a better knowledge about footcandle calculations to direct me, so any help here is appreciated:
So the basic formula of fc is "Foot-candles = lumens/ area in square feet" but I don't understand how the vertical distance of light source is not effective in this calculation? How come the lumen amount (lumens: a measure of the total quantity of visible light emitted by a source per unit of time -by Wikipedia) does not reduce depending of the vertical distance of the light source to the surface? Why is the height and/or angle of the light source is not considered in this formula? If they do -I am almost sure they do- why NCARB doesn't give us those? Please -if you can- help me understand what am I missing here?
PS: I took/failed PPD & PDD once before so believe me, getting to the bottom of this issue is not just scientific curiosity of mine.
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