In order to test which cameras performed best in low light, I set up five cameras simultaneously recording, for several days. I started the recording at night, so as to pick up dawn the following day.
The Firefly 8S suffered an overheating problem while in use and on charge.This resulted in the battery expanding, and popping the front off the case.
My latest action camera arrived yesterday. It is a Hawkeye Firefly 8S (90 degree lens) with true 4k, including for time-lapse footage. It can shoot in slow motion at 120fps at 1080p, has controllable iso, which will allow me to force a 100 iso to keep noise in the image to a minimum.