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.
Candidate Recommendation Initial specification

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
ExperimentalNon-standard
Chrome No support NoEdge Full support YesFirefox Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 22 — 61
Notes
Notes Not supported for MacBook with Touch Bar and Windows 7 (see bug 754199).
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 15 — 61
Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?
value
ExperimentalNon-standard
Chrome No support NoEdge Full support YesFirefox Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 22 — 61
Notes
Notes Not supported for MacBook with Touch Bar and Windows 7 (see bug 754199).
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoEdge Mobile Full support YesFirefox Android Full support 62
Notes Disabled
Full support 62
Notes Disabled
Notes See bug 1462308.
Disabled From version 62: this feature is behind the device.sensors.ambientLight.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 15 — 61
Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also