AmbientLightSensor: illuminance property

Secure contextLimited availability

The illuminance read-only property of the AmbientLightSensor interface returns the current light level in lux of the ambient light level around the hosting device.

Value

A Number indicating the current light level in lux.

Examples

if ("AmbientLightSensor" in window) {
  const sensor = new AmbientLightSensor();
  sensor.addEventListener("reading", (event) => {
    console.log("Current light level:", sensor.illuminance);
  });
  sensor.addEventListener("error", (event) => {
    console.log(event.error.name, event.error.message);
  });
  sensor.start();
}

Specifications

Browser compatibility