After smoking weed I started to see flashes of light?

I smoked 2 blunts with purple kush and another 2 that was strong too, it tasted good but I forgot what it was called. I was with 5 other people, but out of nowhere I started to see flashes of this white neonish-blue light. Even my friends saw it at the same time I did. It was pitch black dark, so what was going on?
 
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