/usr/share/glib-2.0/schemas/org.gnome.lightsoff.gschema.xml is in lightsoff 1:3.18.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | <schemalist>
<schema id="org.gnome.lightsoff" path="/org/gnome/lightsoff/" gettext-domain="lightsoff">
<key name="level" type="i">
<default>1</default>
<range min="1" />
<summary>The current level</summary>
<description>The users's most recent level.</description>
</key>
</schema>
</schemalist>
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