CORROBORATED
CF-GEI-20191250878 CORROBORATED

The Lyon Triangle Lights: A Study in Optical Deception

CASE FILE — CF-GEI-20191250878 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2019-12-19
Location Reported location of the sighting or event
Lyon, Rhône, France
Duration Estimated duration of the observed phenomenon
Brief observation during photography session
Object Type Classification of the observed object based on witness descriptions
formation
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
1
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On December 19, 2019, at 00:30 hours, a lone witness in Lyon, France stepped onto their balcony to photograph the night sky using a mobile phone. Between successive photographic exposures, the witness detected three fluorescent green luminous points arranged in a triangular formation. The witness promptly submitted photographs and video footage to GEIPAN (Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non Identifiés), France's official UFO investigation unit operated by CNES (Centre National d'Études Spatiales). GEIPAN analysts examined the submitted materials using IPACO software, a specialized tool for photographic and video analysis of aerial phenomena. The technical investigation revealed the luminous sources creating the artifacts visible in the video, concluding that the triangular formation resulted from multiple optical reflections caused by light from a Christmas garland (guirlande) within the camera's field of view. The reflection pattern created the illusion of external aerial objects when viewed through the phone's lens system. The case presents an interesting investigative challenge: while the photographic evidence definitively shows optical artifacts, the witness explicitly stated they observed the phenomenon with their naked eyes before capturing it on camera. This eyewitness claim—distinct from the photographic record—complicated what would otherwise be a straightforward misidentification. The witness provided minimal positional data in their questionnaire, referring investigators solely to the photos and video for phenomenon description. GEIPAN classified this case as 'B' (probable misidentification) rather than 'A' (explained) due to the witness's insistence on direct visual observation, which reduces confidence in the optical reflection hypothesis despite strong photographic evidence.
02 Timeline of Events
00:30
Initial Sky Photography Session
Witness steps onto balcony in Lyon to observe and photograph the night sky using mobile phone. Christmas garland present in the environment.
00:30-00:35
Discovery of Triangle Formation
Between successive photographic exposures, witness notices three fluorescent green luminous points arranged in triangular configuration. Captures additional photos and video footage.
December 2019
Evidence Submission to GEIPAN
Witness submits photographs, video footage, and testimony questionnaire to GEIPAN for official investigation. Provides minimal positional data, directing investigators to visual materials.
Post-incident
IPACO Technical Analysis
GEIPAN analysts use specialized IPACO software to examine video and photographic evidence, identifying light sources and optical reflection pathways.
Investigation conclusion
Classification as 'B' - Probable Misidentification
GEIPAN determines optical reflection from Christmas garland as probable cause. Case classified as 'B' rather than 'A' due to witness's insistence on naked-eye observation distinct from photographic record.
03 Key Witnesses
Anonymous Witness 1
Amateur sky photographer
medium
Resident of Lyon who engaged in casual night sky photography from residential balcony. Submitted evidence promptly to official authorities but provided minimal observational details beyond visual materials.
"The witness declares having seen the phenomenon with their own eyes [beyond what was captured on camera]."
04 Analyst Notes -- AI Processed
This case exemplifies the methodological rigor of GEIPAN's classification system and the complexities of eyewitness testimony versus physical evidence. The investigation demonstrates good case consistency—single witness, photographic evidence, video documentation, and prompt reporting. IPACO software analysis definitively identified the light source (decorative garland) and optical pathway creating the triangular reflection pattern. Under normal circumstances, this would warrant an 'A' classification (fully explained phenomenon). However, GEIPAN's decision to downgrade to 'B' classification acknowledges an important investigative principle: the witness claims direct visual observation independent of the camera. Several factors affect credibility assessment. The witness was actively engaged in astrophotography, suggesting some familiarity with night sky observation, yet they apparently didn't recognize an optical artifact—a common issue even among experienced photographers using mobile devices. The witness's failure to provide detailed positional data beyond the visual materials is notable; experienced observers typically document angular positions, movement patterns, and reference points. The timing (00:30, just past midnight) and setting (residential balcony with decorative lighting) are consistent with the optical reflection hypothesis. The fluorescent green color is characteristic of LED Christmas lights and their interaction with mobile phone camera optics, particularly lens coatings and internal reflections in multi-element smartphone lenses.
05 Theory Comparison
BELIEVER ANALYSIS
Genuine Aerial Phenomenon with Photographic Coincidence
The witness explicitly states they observed the three luminous points with their naked eyes, not just through the camera. If accepted at face value, this suggests a genuine aerial phenomenon that happened to appear visually similar to the optical reflections captured on video. The timing would be coincidental—an actual triangular formation of lights appearing simultaneously with optical artifacts. This theory would explain why the witness was confident enough to report the sighting despite the reflections visible in their footage. However, this requires accepting a remarkable coincidence and relies solely on uncorroborated eyewitness testimony without supporting observational data.
SKEPTIC ANALYSIS
Complete Misidentification with Retrospective Memory Contamination
The witness likely never observed the phenomenon with naked eyes as claimed, but rather discovered the 'lights' when reviewing photos on their phone screen between shots. After seeing the compelling triangular pattern in the images, the witness's memory may have been contaminated, creating a false recollection of having seen the lights directly. This phenomenon—where photographic or video evidence alters memory of the original experience—is well-documented in cognitive psychology. The witness's lack of specific positional data and reliance solely on visual materials supports this interpretation. The setting (late night, casual observation, focus on phone screen) makes perceptual error highly probable.
06 Verdict
ANALYST VERDICT
This case is almost certainly explained as an optical reflection artifact created by smartphone camera optics interacting with nearby decorative lighting. The GEIPAN technical analysis using specialized software provides compelling evidence for this conclusion, identifying both the light source and the optical mechanism. The witness's claim of naked-eye observation introduces uncertainty, but several factors suggest perceptual error or retrospective contamination: the phenomenon was discovered between photo attempts (suggesting primary detection through the phone screen), the lack of detailed observational data, and the perfect match between the video artifacts and known optical reflection patterns. Classification as 'B' (probable misidentification) is appropriate given the slight possibility the witness observed something genuine that coincidentally appeared similar to the photographed reflections. However, confidence in the optical reflection explanation exceeds 85%. This case has minimal significance beyond serving as an educational example of how modern smartphone photography can create convincing but artificial aerial phenomena, and demonstrates GEIPAN's careful approach to witness testimony even when physical evidence points strongly toward mundane explanations.
AI CONFIDENCE SCORE:
85%
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