Agent you are correct in what the figure would be.
choader
foot candles and lumen are the same.
You are mistaken to use lumen and not have your units match up
E=I/d^2 with d in FEET because of the measurement of the lumen by definition. So when you use a light meter to measure foot candles(E) at one foot it should equal the lumen rating for the bulb.(in theory but the bulb doesnt all point at the light meter) As the equation goes i may be wrong in that you need to multiply by 4pi(d^2) or something to get the area. but that would be for the light around the whole light at a distance d. I am fairly certain that the 4pi can be canceled out because you are just using a square foot on the sphere. So for E=9000 you can find the lumen by 9000*(1ft^2)= 9000 lumen. Im on summer break and really not functioning correctly so maybe when i sort that out i will try to do the same here. |