I have my camera set to take a 3-pix sequence for each triggering. The pictures I have attached here are a ones taken before and after the strange light pix. If you look at the post-light pix the weeds are still glowing three days after the light appeared. You can compare them to the pre-light pix.
The light also is perfectly centered, left to right in front of the camera.
My mineral block, set out exactly two weeks before was missing without a trace.