I photographed Christmas light to get some bokeh balls and I got a unique effects with my Voigtlander 40mm lens.
If you look closely, you'll see circles expanding from the middle of each ball. I've never seen bokeh balls like this before. The lights used may have been LED, although I'm not sure, or even if that is what caused the effect.
This was taken with Kodak Portra 800 film using a Nikon FM2n camera. I set the focus to infinity and the aperture to f/2.
Voigtlander circle effect on Bokeh balls
Same circle effect but less so.
No circle effect on this one.