1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Conversion to lux (Light intensity)

  1. Aug 21, 2009 #1
    How would I go about converting 59.7 mw/m^2 to lux?

    I would appreciate any help I can't find an equality.
  2. jcsd
  3. Aug 21, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper


    Hi Petrucciowns! :smile:

    1 lux = 1 lumen per m2

    1 lumen = 1 candela steradian (http://en.wikipedia.org/wiki/Lumen_(unit))

    and (http://en.wikipedia.org/wiki/Candela#Definition) …
  4. Aug 21, 2009 #3
    Yes, but those conversions don't match up with the variables that I have.
  5. Aug 21, 2009 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    It depends on the wavelength.

    For 555 nm light, 1 W/m^2 is equivalent to 683 lux.

    For other wavelengths, multiply that by the human eye sensitivity function.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook