I'm using .ies file as a point light, and I would like to understand parameters related to .ies files available in Blender more in depth, especially the definition of Efficacy. In my experiements I'm using Irradiance AOV.
As it's poined out in the LuxCore's docs (redirects to Wikipedia), the efficacy is ratio of luminous flux to power. In my experiment I first opened .ies file with another program, which displays parameters of .ies files, as shown on image:
![Image](https://i.ibb.co/DDqWYPt/ies-desc.png)
I suppose power and luminous flux are defined in each .ies, and those should be also read by BlendLuxCore (please correct me if I'm wrong?).
In Blender API it's written that if "setting 0 for both power and efficacy bypasses this feature and uses only the lamp gain". I leave gain 1 (as default), so I would expect that power of .ies file would be read from provided .ies file and efficacy would be calculated as efficacy = luminous_flux/power. BlendLuxCore should in that case set Power=61 and Efficacy=6400/61= 104,91.
But something else happens... I am sending the comparison of experiment1 (power=efficacy=0) and experiment2 (power=61,efficacy=104,91).
![Image](https://i.ibb.co/tmQk2kf/comparison.png)
So my questions are: How exactly is efficacy defined and used in LuxCore? How is it used in Irradiance AOV? Which efficacy value would be correct for me to use instead of 104,91 in the case above?
Thank you very much for your time and help!
![Smile :)](./images/smilies/icon_e_smile.gif)