4+ folder

Im not sure how light you consider to be light, but you could always look at the Spyderco Endura (I think it's a 4 inch blade) as well as the Spyderco Police, the models with the FRN handels shouldn't weigh too much.
 
Cold steel folders. lots of them are 4+ inches and light. go up to 6 inch folders.
 
cammilus cuda maxx - 5.5" - probably one of the best mega folders ever, the ralph custom versions are even better FWIW, both the production and the custom are high $$ now though.

spyderco police is + 4".

my favorite is the custom pat crawford perfigo its ~4.5" and slim and lite and carries well, it was designed by bob kasper, i like the way he does the handles on knives, folders and fixed, a very secure grip. no production one available though.

extrema ratio nemisis is +4" ~ 4.5" IIRC and a great albeit heavy folder, a heavy duty folder too imho as HD as a strider.
 
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