Re: Can this somehow be used to measure laser powe
Per wikipedia (search for Lux - I'd post the link, but I can't yet), it is possible to convert between lux and mW. However, it's not just a simple formula:
"The lux is one lumen/meter2, and the corresponding radiometric unit, which measures irradiance, is the watt/meter2. There is no single conversion factor between lux and watt/meter2; there is a different conversion factor for every wavelength, and it is not possible to make a conversion unless one knows the spectral composition of the light.
The peak of the luminosity function is at 555 nm (green); the eye is more sensitive to light of this wavelength than any other. For monochromatic light of this wavelength, the irradiance needed to make one lumen is minimum, at 1.464 mW/m2; one obtains 683.002 lux per W/m2 (or lumens per watt). Other wavelengths of visible light produce fewer lumens per watt. The luminosity function falls to zero for wavelengths outside the visible spectrum."
So, theoretically it could be done, but it would require some experimentation and calibration to work. Since we are dealing with monochromatic coherent light, it should be less complex than for broad spectrum light.
