Mark Lloyd wrote:

I once had an audio amplifier with a solar cell rather than a microphone
for the input transducer. This made it possible to listen to light. The
sun is steady, incandescent lights (AC powered) hum.

That was 40 years ago. Maybe something like that would work today.

Certainly if you connect a solar cell to an oscilloscope, you can see
the difference between

incandescent and LED GU10 lamps fed 240V mains

incandescent and LED MR16 lamps fed 12V from an electronic 'transformer'

a dimmer feeding either of the above.