# light intensity equation

• September 13th 2012, 01:14 PM
onaslowtrain
light intensity equation
I have an equation I need help solving that deals with light intensity.

Ez = E0 * e(-k*z) is the formula with all the variables.

The equation I need to solve is Ez = 25,000 lux * e (.12 m^-1 * 5m) where (e) is exponential function.

Thanks to all.
• September 13th 2012, 01:41 PM
skeeter
Re: light intensity equation
note that ...

$0.12m^{-1} \cdot 5m = 0.6$
• September 13th 2012, 02:17 PM
onaslowtrain
Re: light intensity equation
given that light intensity declines exponentially with depth, how does that work with the above equation. do i take e^.6 m and subtract that from 25,000 lux?
• September 13th 2012, 04:52 PM
Wilmer
Re: light intensity equation
Quote:

Originally Posted by onaslowtrain
given that light intensity declines exponentially with depth, how does that work with the above equation. do i take e^.6 m and subtract that from 25,000 lux?

Huh? 25000 * e^.6 = ~45553