The light source component is used to provide light to near by plants, this component should be added to any blueprint with a light that you wish to provide additional light stats to plants. Light source components can be added to any blueprint the same way you add any component in the components panel.

They should not be added to your directional light as the Light Detectors already check for line of sight to the Direction light in your level.

When you select a light source component in a blueprint you will have the settings shown below in the Details panel.

Here you can change this light source settings for the blueprint you select it in, you can hover your mouse over each settings name to get a tooltip with more info about each setting.

Settings

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You can enable and disable the light source using the Enabled setting, this can also be changed using blueprint nodes, there is an example of this in the grow light blueprint.

The Light Amount is the amount of light given to plants within the Light Radius distance of the light source, this light value will only be applied to the plants if nothing is blocking their view of the light, so it will not effect plants though walls for example.

Plants within the light radius will revive light from this light source, this value is in CM so 100 would be 1 meter.