Converting Lux to Watts: A Quick Guide

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SUMMARY

This discussion focuses on converting luminance measurements from V/(lx-s) to V/(um/cm²) specifically at a wavelength of 555nm. Participants shared resources, including a link to a relevant optics site that provides additional information on photometric conversions. The exchange highlights the importance of understanding the relationship between lux and other measurement units in optics.

PREREQUISITES
  • Understanding of photometric units, specifically lux (lx).
  • Familiarity with the concept of luminance and its measurement.
  • Basic knowledge of optics, particularly wavelength relevance (555nm).
  • Ability to interpret conversion factors in photometry.
NEXT STEPS
  • Research the conversion formulas between lux and other photometric units.
  • Explore the significance of the 555nm wavelength in photometry.
  • Learn about the application of V/(um/cm²) in optical measurements.
  • Investigate additional resources on photometric standards and conversions.
USEFUL FOR

Optics professionals, photometric engineers, and anyone involved in light measurement and conversion processes will benefit from this discussion.

phy_optics
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Hello frnds!

Can anybody convert the following factors?

V/(lx-s) to V/(um/cm2) at 555nm ??

Thank you.
 
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This site may be useful.
http://www.optics.arizona.edu/Palmer/rpfaq/rpfaq.htm"
 
Last edited by a moderator:
Dear dlgoff! Thank you very much. It really useful to me.
 
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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