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Older versions (v3.16 and below) are available for devices running Android 4.4 KitKat.

While it works on non-rooted devices using a standard overlay, rooted users benefit from a special driver that converts images to grayscale before applying filters, resulting in higher contrast and sharper detail. cf lumen apk download

For users looking to bypass the Play Store or install specific older versions, you can find the CF.lumen APK on APKMirror or Uptodown . CF.lumen for Android - Download the APK from Uptodown Older versions (v3

Includes a dedicated red filter for sleeping hours, which preserves night vision and minimizes eye strain in total darkness. cf lumen apk download