Just a generalized source from all around. I've just massaged the exposure of the photo to very high to be able to see anything at all in the picture. If I go any higher the sky gets very blue and blotchy. It's the general glow of the city lights as background. It's definitely not reflective on anything we're seeing. Whatever they are, they are the light source when they light up and when they are bright, they light up the fronds around them to true color green.
These were not hovering, but moving at high speed in the tri-lobed photo. Very high speed, leaving what looked like a light trail.
Yeah I get that you cranked the exposure. But the shadows on the tree trunks suggest point source. But maybe not. If it was a diffused source then reflections are out and the objects are generating their own light...but then what, fairies?