I needed a way to illuminate my Pi ZeroW microscope setup, so decided to use my new flashlight and find a way to attach it to the existing M8 threaded rod.

I don't like ring lights as they create too much shine being vertically above the subject, this is at 45 degree next to the subject so doesn't cause glare (maybe some shadow though).

See also my related Pi ZeroW case with CS mount and industrial lens mount