As can be seen with a few adjustments to the original photo (brightness, contrast + adding a colour filter etc.)
The "little green man" (ahem) is still green. where as the original light source suggested for lens flare shows as an entirely different colour.
This was would suggest its NOT lens flare - lens flare is basically light falling onto the lens which does not directly enter the image recording area (be it frame of film or sensor on digital) and although small changes maybe seen in the colour spectrum of the direct and reflected light (flare) due to lens coatings etc.
I have never seen such a large difference in that spectrum caused by flare.
Having played with the image some more it does appear as if there are 3 brighter globes of light within the beam (notice I didn't say orbs!) giving it an almost traffic light appearance.
However all that said - it does not mean it is not lens flare caused by a different light source which cannot be seen in this picture !