Hi Meng Lee,
From my experience, 1 hour 52 min is really insufficient to get anything decent in Bortle 7 skies (and that's my assumption, based on Bernard's rooftop astrophotography location
https://singastro.org/forum2/viewtopic. ... 43#p143243 ). It'll need at least 3 hours of integration time just for assessing the shot and 6 hours to get something decent to work with.
I think, although I haven't done anything yet (still waiting for my gear to arrive), I think the major problem is getting enough clear nights to get the integration time. If it is possible to do 3 hours a night and only have 1 night/month, then it's still ok in my book. IMO, looking at the light pollution, I think the target will have to be at least 40 deg above the horizon to reduce its effects.
Personally, I'd stay away from any light pollution filters because with the LED street lights, they don't help at all anyway. With the data that you've already collected, I'd say just use it for LUM because the colours are all messed up as you noted. The only filters I'd use would be narrowband to get the H2 and O3 data. These filters will definitely help in light polluted skies.
From your experience, are the nights clear enough to do 3 hours?
cytan