Conversion to lux (Light intensity)

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SUMMARY

The conversion of 59.7 mW/m² to lux requires understanding the relationship between radiant power and luminous flux. Specifically, for light at a wavelength of 555 nm, 1 W/m² is equivalent to 683 lux. To convert other wavelengths, one must apply the human eye sensitivity function to adjust the conversion factor accordingly. This discussion highlights the importance of wavelength in determining accurate lux values from mW/m² measurements.

PREREQUISITES
  • Understanding of luminous intensity and its measurement in candelas.
  • Familiarity with the concept of luminous flux measured in lumens.
  • Knowledge of the human eye sensitivity function and its application in photometry.
  • Basic principles of light measurement, including radiant power in watts per square meter.
NEXT STEPS
  • Research the human eye sensitivity function and its impact on light measurement.
  • Learn about photometric units and their conversions, specifically between watts and lux.
  • Explore the effects of different wavelengths on light intensity measurements.
  • Study the principles of photometry and how they apply to various light sources.
USEFUL FOR

Students and professionals in optics, lighting design engineers, and anyone involved in photometric measurements and conversions.

Petrucciowns
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How would I go about converting 59.7 mw/m^2 to lux?

I would appreciate any help I can't find an equality.
 
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Petrucciowns said:
How would I go about converting 59.7 mw/m^2 to lux?

I would appreciate any help I can't find an equality.

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) …
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1⁄683 watt per steradian.
 
Yes, but those conversions don't match up with the variables that I have.
 
Petrucciowns said:
How would I go about converting 59.7 mw/m^2 to lux?

I would appreciate any help I can't find an equality.

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.
 

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