Question about emission line filters.

Hello everyone!
I am thinking (weather permissions...) of starting to image deepsky objects. The point is that I am living in most light polluted skies in the world - just several miles to the south of the Times Square )) ((. Traveling to the dark sites with tons of equipment is not as easy as it was seems to me before.
If I will spend for Ha, O-III, Su, filters - do I still needed dark site for L-channel? As far as I've seen I did not find anything about L-channel with Ha,O-III,Su filters. Or maybe it's too obvious to mention? And could I beat light pollution the way I think?
Thanks for your help.
Russ.

P.S. BTW - is anyone knows time of the next blackout in my area? )))))))))

With the narrow band filters you would only take a SII; Ha; OIII, and combine them as a RGB. There are different band width for these filters out there. The lower the number on the filter the narrower the band, the less light it will let in.
Hope this helps in some way

Mark