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# Creating a Light Filter Using the GafferThree Node

Light filters allow you to modify a light's behavior in order to give these light sources additional effects. Light filters are renderer-specific, but regardless of renderer, you can add them in the GafferThree node in the same way.

To create a light filter with the GafferThree node:

| 1. | Create a GafferThree node and place it within the project.

| 2. | Select the GafferThree node and press Alt+E.

The GafferThree node becomes editable within the Parameters tab.

| 3. | In theGafferThree node’s Parameters tab, right-click in the Gaffer object table and select Add > Light Filter or press F.

A light filter is added in the Gaffer object table.

Note: The light filter location is created under /root/world/lgt/gaffer by default. You can change the scene graph location by setting a new path in the root location field in the GafferThree node's Parameters tab.

### Creating a Light Filter Reference Using the GafferThree Node

Light filter references are light filters attached to a light or skydome that reference another light filter package. These packages allow you to apply multiple light filter effects as only one light filter on a pre-existing light.

To create a light filter reference with the GafferThree node:

| 1. | Create a GafferThree node and place it within the project.

| 2. | Select the GafferThree node and press Alt+E.

The GafferThree node becomes editable within the Parameters tab.

| 3. | In theGafferThree node’s Parameters tab, right-click in the Gaffer object table and select Add > Light or press L.

A light is added in the Gaffer object table.

| 4. | Right-click the light and select Add > Light Filter Reference or press Alt+F when the light is selected.

A light filter reference is added to the light.

| 5. | Select the light filter reference and click on the Object tab beneath the object table list. Specify the path to the light filter package in the referencePath field.