Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The AmbientLightSensor interface of the Sensor APIs returns the current light level or illuminance of the ambient light around the hosting device.

To use this sensor, the user must grant permission to the 'ambient-light-sensor' device sensor through the Permissions API.

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. The Feature-Policy HTTP header article contains implementation instructions.

EventTarget Sensor AmbientLightSensor


AmbientLightSensor() Experimental

Creates a new AmbientLightSensor object.

Instance properties

AmbientLightSensor.illuminance Experimental

Returns the current light level in lux of the ambient light level around the hosting device.

Instance methods

AmbientLightSensor doesn't have own methods. However, it inherits methods from its parent interfaces, Sensor and EventTarget.


AmbientLightSensor doesn't have own events. However, it inherits events from its parent interface, Sensor.


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.message);


Ambient Light Sensor
# ambient-light-sensor-interface

Browser compatibility

BCD tables only load in the browser