My 6x17 camera has quite a large window to see the frame numbers and no red filter, that hasn't been a problem even when I've forgotten to close the slider and that was in the usually bright sunshimne of the Aegean cost in Turkey which is just about the maximum my light meters can read

That's with HP5/Tmax & Delta 400 as well as slower films including Fomapan 200. No problems with my old Nettar either.

Ian