AS4282 is the standard for intrusive light. Unfortunately the threshold is so high that I think it is pretty much useless. It seems to be formulated around sleep disturbance without any consideration of any other impact. I have a similar situation where a business is shining a floodlight directly at me, illuminating my entire house and it only just triggers the bedroom level. My photos are very similar to yours.
I'd think Ausgrid should be pretty reasonable about this if you contact them though.
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