The conversation between human and AI assistant.
How red yellow green colors glow in traffic signals?
How do they make the lights so bright?
The brightness of an LED is determined by the amount of electric current passing through it. In traffic signals, the LEDs are designed to be very bright so that they can be seen even in bright sunlight or at long distances. They also use special lenses to direct the light in a specific direction so that it is visible to drivers.