# Alloy Backlight API

**URL:** <https://forum.repebble.com/t/alloy-backlight-api/629>\
**Category:** Watchapp/Face Developers Corner\
**Created:** [May 9, 2026, 2:30am UTC](https://forum.repebble.com/t/alloy-backlight-api/629 "2026-05-09T02:30:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Akuake](https://avatars.discourse-cdn.com/v4/letter/a/a9a28c/32.png) [@Akuake](https://forum.repebble.com/u/Akuake)\
**Post date:** [May 9, 2026, 2:30am UTC](https://forum.repebble.com/t/alloy-backlight-api/629/1 "2026-05-09T02:30:01Z")

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Is there an Alloy API to trigger the backlight? The documentation currently at [Backlight // Pebble Developers](https://developer.repebble.com/guides/events-and-services/light/) looks like it’s in C.

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**Author:** ![stc1988](https://yyz1.discourse-cdn.com/flex033/user_avatar/forum.repebble.com/stc1988/32/322_2.png) [@stc1988](https://forum.repebble.com/u/stc1988)\
**Post date:** [May 9, 2026, 5:43am UTC](https://forum.repebble.com/t/alloy-backlight-api/629/2 "2026-05-09T05:43:13Z")

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It looks like this was supported in a recent [Moddable SDK release](https://github.com/Moddable-OpenSource/moddable/releases/tag/8.1.0). It should be usable in a future Pebble firmware and Pebble SDK releases.

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**Author:** ![edb](https://yyz1.discourse-cdn.com/flex033/user_avatar/forum.repebble.com/edb/32/272_2.png) [@edb](https://forum.repebble.com/u/edb)\
**Post date:** [May 19, 2026, 1:44pm UTC](https://forum.repebble.com/t/alloy-backlight-api/629/3 "2026-05-19T13:44:17Z")

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The example at Moddable seems to only turn the backlight on and off. Hopefully we get full RGB control in JS soon.

My watchface looks really cool with a coloured RGB backlight but don’t want that the whole time for the OS.

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**Author:** ![Akuake](https://avatars.discourse-cdn.com/v4/letter/a/a9a28c/32.png) [@Akuake](https://forum.repebble.com/u/Akuake)\
**Post date:** [May 19, 2026, 2:55pm UTC](https://forum.repebble.com/t/alloy-backlight-api/629/4 "2026-05-19T14:55:57Z")

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Yup, looks like the watch.light() function in the js example takes a boolean. It’s a step in the right direction.