Error: Rendering with Radiance p. 319 Luminaire Modeling

I just had occasion to go through Chas. Ehrlich's luminaire modeling procedure given in *Rendering with Radiance* and there is an error on page 319 of the text. The radius of a unit sphere is 0.282095, not 0.56419. Both the number in the text and the ies2rad command are wrong.



Randolph M. Fritz