23-02-12, 10:25 AM
Alan, those "orbs" are either small insects very close to the camera or specular reflections off distant shiny objects such as a discarded beer can. The light source is the camera's own flash, the auto-focus doesn't work too well at night so the bright point of light is defocussed and the lens contributes a bit of flare and diffraction to provide the internal detail you see on the image.