Yeah I can hear CRTs anywhere in the house. Drives me crazy how loud they are. CFLS can be pretty bad too. I go out of my way to find amperage controlled LED

Yeah I can hear CRTs anywhere in the house. Drives me crazy how loud they are. CFLS can be pretty bad too. I go out of my way to find amperage controlled LED fixtures because they seem to be the only light source that doesn't hum. Worse are those ultrasonic occupancy sensors. In some spots i the room I can hear a really high pitched buzzing noise. I think it has to with beat frequencies and the caps they use to step up the frequency internally.