# Lighter version of sans serif typeface

I am using the Frutiger font as the sans serif font in my document. It is invoked by

\renewcommand{\sfdefault}{pfr}

However this font is too bold for my taste. There is a ligher version available. I would like {\sf Test} to be rendered as

{\fontfamily{pfr}\fontseries{l}\selectfont Test}

and {\sf \textbf{Test}} to be rendered as

{\fontfamily{pfr}\fontseries{m}\selectfont Test}

(that is, the normal variant is now used as the bold typeface). How do I achieve this? I don't know the proper commands to so this and I suspect my \renewcommand is not the correct way of switching to Frutiger in the first place.

-
Adding a command \renewcommand{\seriesdefault}{l} also affects my serif font. –  Ben Mar 4 '12 at 14:46
You didn't mention which package you use for the font support. Can you add a minimal working example (MWE) that can be experimented with? –  Andrey Vihrov Mar 5 '12 at 19:55
I cannot add a minimal working example because I ama using non-fee typefaces. I am not using a package, just the command I mentioned. –  Ben Mar 7 '12 at 22:06