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

The DeviceLightEvent provides web developers with information from photo sensors or similiar detectors about ambient light levels near the device. For example this may be useful to adjust the screen's brightness based on the current ambient light level in order to save energy or provide better readability.

Properties

DeviceLightEvent.value
The level of the ambient light in lux.

Example

window.addEventListener('devicelight', function(event) {
  console.log(event.value);
});

Specifications

Specification Status Comment
Ambient Light Sensor
The definition of 'Ambient Light Events' in that specification.
Working Draft Initial specification

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

  
Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support (Yes) 22.0 (22.0)[1][2] No support No support No support
  
Feature Android Webview Chrome for Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support (Yes) 15.0 (15.0)[1][2] No support No support No support

[1] The devicelight event is implemented and preference enabled by default in Firefox Mobile for Android (15.0) and in Firefox OS (B2G). Starting with Gecko 22.0 (Firefox 22.0 / Thunderbird 22.0 / SeaMonkey 2.19) a desktop implementation for Mac OS X is also available (not working for macbook with touchbar). Support for Windows 7 is in progress (see bug 754199).

[2] This event has been disabled by default in Firefox 60, behind the device.sensors.ambientLight.enabled preference (bug 1359076).

See also