I created some quick tip, how to use IES light in cycles.
Maybe it will be helpfull for you
Sorry, the audio on your video is too quiet, and there is a loud pitched buzzing noise… I can’t follow it… too distracting
I´m sorry for bad quality of sound. Please do you know any good sw to screen snap? I will try to make it again with better quality.
Nice Trick. (Unfortunately still a Trick - not real IES)
IES are physical data and your technic is just a fake IES (but a good trick )