Correction to Tech Support
The original Silver PLM was very close to the current Extreme Silver. The current version has been reshaped to focus better and to project a more even pattern with higher output.
See
http://www.paulcbuff.com/plm-competitor.phpThe Soft Silver doesn't require critical focusing, has lower output but covers a much wider, feathered area. For me, the GO TO modifier . . . . much higher output and doesn't spill all over like a softbox or white umbrella and has a nice degree of sparkle.
Sorry for any confusion.