1 Photoelectric light controls are weirder than they seem
Recommended for understanding how commercial dusk-to-dawn light switches work, and also offered as a learning aid on thyristors and SCRs.
Topic
light sensors
2 videos. Ranked by independent recommendations, not by views.
2 LED Matrix Light Sensor
Shows that an ordinary LED can double as a crude light detector, a trick people cite often, with the caveat that it needs plenty of light.
