This is the question Find the intensity of a light source that produces an illumination of 7.50 lux at a distance of 30m from the source. This what I get but it's wrong 84823 This is the formula E = Illumination I = luminous intensity of the source ( in lumens) r= distance between the source and the illuminated surface. 1 lux = 1lm/m^2 Formula E = I/(4*pi*(r^2) So I did I = E*(4*pi*(r^2) I =? E=7.50 r = 30m I = 7.50lux*(4*pi*(30m^2) and got I = 84823 rounded in many different forms and I still get a wrong answer.. Any help would be appreciate it. and is wrong because the computer practice test tells me but doesnt give me an answer.