Comment by floxy

I as skeptical as the next guy when it comes to the claim that ambient audio modulates the fluorescent light. But I could sure use more details on what analysis was done to the photos. Sounds like there were several photos taken, say 100ms(?) apart. Then the photos were subtracted pixel-by-pixel to look at the variations in time (between photos) or spatially (neighboring pixels)? I still think a photo-diode AC-coupled to a high gain amplifier fed into an oscilloscope would be the more conclusive test. Do a audio frequency sweep from 100-10kHz. Both with the fluorescent light on, and then again with the light off (as a control, in case something else in the setup is sensitive to the audio).