I Unidentified Luminescent Phenomena (ULP)

AI Thread Summary
An individual reported witnessing an unidentified luminescent phenomenon (ULP) on December 31, 2021, while in Arizona. The event involved a bright flash of light, approximately 8 feet in diameter, accompanied by a sound reminiscent of a camera flash, observed by both the individual and a skeptical friend. The flash occurred indoors, about four feet behind the observer, and was not attributed to any known optical or environmental causes, as it cast shadows and was seen by both parties simultaneously. Despite attempts to replicate the event, they found no explanation for the occurrence. The experience raises questions about the nature of the phenomenon, leaving the observer seeking insights from others.
ZackMI6
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TL;DR Summary
A sudden bright flash of light that lasts about 1 second. Light source is unidentified and seemingly appears in the middle of the air and disappears in the middle of the air. Sound sometimes accompanies the flash, and sometimes does not. This strange phenomena is extremely difficult to document as it happens at entirely random times and places.
My personal experience with ULP;
Experience happened on December 31st, 2021 at approximately 1400 hours or 2:00PM. I am going to keep my name and identity undisclosed because this is still the internet. I live Arizona and it was a mildly rainy day. My friend and I had been doing some hiking and we get back to my house. We go out to the back patio to enjoy some water and cool off. I am standing just on the other side of the back door with the back door open. I am facing my friend who is outside standing facing me. To be clear, I am looking outside through the open back door and my friend is looking inside at me. We are casually talking when I see in my peripheral vison a very bright light. I see it in my peripheral vision for about 0.5 seconds and then turn around and manage to see the full "flash" or "orb" of light for about another 0.5 seconds. I call it a flash because it was accompanied by a flash the sound an old 1940s camera where you would have the take the bulb out of the camera and replace it with a fresh one after you take the picture. My friend standing looking inside at me had seen it as well and was totally baffled. My friend is a very skeptical person when it comes to anything he knows is controversial or strange. He went to instantly trying to find the origin of the strange flash but was left dumbfounded when he could not explain it. The flash happened about 4 feet behind me from where I was standing. Like I stated earlier, my back was turned when it happened and I saw the light out of the corner of my eye; hence I turned around and saw it. The flash was about 8 feet in diameter. The flash happened in my living room, but more close to the back door. We were looking around in the living room and attempted to replicate the strange event multiple times without any success.

I can disprove that is was not the vitreous pulling away from the retina as the light casted shadows and was observed by my friend at the same time. I know it was not the vitreous pulling away from the retina on his part either because he told me my body was blocking part of the flash that he saw, and could distinguish that the light came from behind me, and not something only seen in his vision. He heard the sound that a "camera flash" would make as well, but not as loud as he was about 10 feet from the flash. We believe that the flash was an event that took place in reality and was observed at the same time by two separate people from different perspectives. My experience is different from lots of other people's experiences because it took place in the middle of the day with sunlight and it was observed by two people from different perspectives.

I don't even know where to start in trying to understand what this might have been, how, and why? The event happened without warning or without any apparent cause or reason.

Does anybody know what this is?

Old forum with more stories & info-
https://www.physicsforums.com/threads/strange-white-flash-in-a-dark-room-ii.451850/
 
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