> For the complete documentation index, see [llms.txt](https://ask.simplehw.eu/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ask.simplehw.eu/kb/sensors/light.md).

# Light

We use a **phototransistor** as our light sensor. This sensor is able to tell the **intensity of light in %** (we cannot report exact lumens). This can be useful in various applications (e.g. you want to know if a package was opened before it's delivered). The API 6 works with light **thresholds**.