/usr/share/kde4/services/plasma-applet-redshift.desktop is in plasma-widget-redshift 0.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Icon=redshift
Name=Redshift
Type=Service
X-KDE-Library=plasma_applet_redshift
X-KDE-PluginInfo-Author=Simone Gaiarin
X-KDE-PluginInfo-Category=
X-KDE-PluginInfo-Depends=
X-KDE-PluginInfo-Email=simgunz@gmail.com
X-KDE-PluginInfo-EnabledByDefault=true
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-Name=redshift
X-KDE-PluginInfo-Version=1.0
X-KDE-PluginInfo-Website=http://plasma.kde.org/
X-KDE-ServiceTypes=Plasma/Applet
X-Plasma-NotificationArea=true
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