[Startrek (Martin)]

Trevor,
I sympathise with your situation but there’s not much you can do about it other than skip Council and approach your local member at State level as it’s a educational facility.He or She maybe able to offer some further advice.I suppose your one of only a few astronomers in the greater area but at least you’ve tried every avenue.

I too have a sports field 150m away with flood lights on most nights until 11pm ( late evening games and training etc…. )
Also my lovely neighbours leave all their exterior and backyard lighting on most nights until late ( for no apparent reason at all , there is no one in the backyard) see photo. I dare not approach them due to previous problems.
And yes my skies are Bortle 7/8 which makes my actual resultant Skyglow probably Bortle 8/9.

To be honest I was surprised imaging M20 LRGB and Ha LRGB about 2 weeks ago during new moon period using 30 sec subs and 8 hrs of data. The resulting image was quite pleasing using my Mono rig.

I’ll be adopting those short subs for Broadband imaging when skies are clear during New Moon.

When the moon is around my Antlia 3nm NB filters are tremendous and allow imaging under my crappy skies all year round.

Hope you eventually find a solution or some compromise

Cheers
Martin