AmbientLightSensor.illuminance

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

If a feature policy blocks use of a feature it is because your code is inconsistent with the policies set on your server. This is not something that would ever be shown to a user. See Feature-Policy for implementation insfructions.

Syntax

var level = AmbientLightSensor.illuminance

Value

A Number indicating the current light level in lux.

Example

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

Specifications

Browser compatibility