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

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.

In the image above the warmth component is disable, this is because it is enabled though blueprint code when the heat lamp blueprint is turn on. You can see an example of this code in the UpdateLightOn function in the BP_MasterGrowLight.

Settings

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

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

Plants within the Warmth Radius will revive warmth from this warmth source component, this value is in CM so 100 would be 1 meter.

Only Detect Plants is used to toggle an actor class filter in the code that checks the actors near the warmth source. Typically you would keep this enabled but this is an option in case you want to modify the warmth source for use with other blueprints.