The discussion centers around the perceived difference in sunlight brightness between two mornings in the San Francisco Bay Area, specifically on July 13, 2016, and a recent morning. One participant notes that the brightness appeared different without using a light meter, suggesting that subjective perception can be unreliable due to factors like recent exposure to darkness. Another participant points out that atmospheric conditions, such as varying levels of aerosols, smog, or fog, could explain the difference in brightness. They reference weather data indicating that the recent morning was partly cloudy while the previous day was clear. There is also mention of using a Desktop Spectrometry Kit to measure light, though concerns are raised about its sensitivity. Overall, the conversation highlights the complexities of measuring and perceiving sunlight brightness influenced by environmental factors.
