Hi RS. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.
I would just do without the Night Light on external if that resolves the pale and too bright. A VGA to HDMI connection is not even close to ideal in the first place, trying to convert old technology to new.
Other ways to calibrate color on an external monitor:
https://www.makeuseof.com/how-to-calibrate-moni...
https://www.techwalla.com/articles/how-to-resol...
https://www.cnet.com/tech/computing/how-to-cali...
https://www.howtogeek.com/342756/how-to-match-c...
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
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