Hi Greg, no prob it is great to get help so quickly when one is learning 
My problem is that I only have a graphical representation, a plot, of the candle power distribution of the luminaire I need to simulate, nothing else. So I was wondering if this would suffice to build a luminaire in Radiance.
If I got it correctly, ies2rad should be always used. When the ies file is not available, and this is case, it should be sufficient to create a ies file based on the plot of the lamp (as described in pag 98 of Rendering with Radiance).
As for the other values needed to build the ies fle (see pag 97 of Rendering with Radiance), I might miss only -lumens per lamp-. Would this be correct?
So in case I should find a calculator to obtain lumens from the candlepower distribution?
Thank you for your help.
PS: Yes I have a copy of the book 