My macro night setup. OM-1 with 90mm macro lens.
The rechargeable LED Cube lights are perfect for a constant, meterable light source.
They are mounted on my camera with a coldshoe bracket and a ball head extender so that I can direct the light as needed.
Amazon LED Cube Light
Amazon Cold Shoe Quick Mount
Amazon Cold Shoe Ballhead Mount
Moth light UV set up....we have several around our yard.
A video I shot a few years ago showing in-camera focus bracketing with the Olympus/OM-1 cameras. I was using the EM5 M1 then, but now use the OM-1 and it stacks up to 15 focus-bracketed shots in the camera.

