Nope. Mains hum is picked up by microphones as well as light intensity: https://en.wikipedia.org/wiki/Electrical_network_frequency_analysis https://en.wikipedi

Nope. Mains hum is picked up by microphones as well as light intensity: https://en.wikipedia.org/wiki/Electrical_network_frequency_analysis https://en.wikipedia.org/wiki/Electrical_network_frequency_a...