It's long been known the Baader (aka Celestron) filter had a broader passband (pun intended). Here are some sites with test results of different filters:
http://www.astrosurf.org/buil/filters/curves.htm
http://www.astroamateur.de/filter/
http://www.sas.org.au/filters.htm
http://home.freeuk.com/m.gavin/grism2.htm
A lot of info there.
An odd bit of info on Lumicon:
bandwidth:
UHC-24nm
OIII-11nm
HBeta-9nm
Don Pensack