3 ms·

If it’s an artificial light source not really

• _Microft 2y ago
  If that concerns you, then you might want to conduct the experiment with a „non-artificial“ light source. Use a candle that you wave your hand around to modulate the signal if you like. If you suspect that it‘s not visible light but infrared that affects the effect, then selectively shield visible light with a (black) garbage bag and try again.