Idea of Light Automation Icon
There is an image of a light bulb. it is the incandescent, screw-in, filament type bulb. To the right and slightly below is an image of a gear. They are close enough together to be seen as a single icon.
This page shows the different variations of the Light Automation from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.