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I have a IES luminaire file of a lamp and some polar candela distribution plots of lenses like: enter image description here

How can I create a new luminaire file combining the lamp with every lens?

I could manually sample the plots in order to retrieve the information from the plot but I haven't been able to fully understand how to weight the candelas values from the IES using the lens plots. I assume the plots are representing the iluminare of an ideal candela through a lens, but I'm not sure. Even if I were correct, there's various distributions (ways to weight each candela value of an IES) that for an ideal candela will output that plot.

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