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# Setting up USD Lights

As well as setting up USD materials, it is also possible to set up USD lights and view them in the Hydra Viewer.

To set up a USD light:

You can use the workflow below to use the GafferThree node with a USD Shader.

1. Create a GafferThree node and open its Parameters, or open the Parameters for an existing GafferThree node.
2. In the GafferThree Parameters tab, right-click under Name and choose Add > Light.

3. In the Material section of the new light parameters, click Add Shader and choose usd > light.

4. In the usdLightShader drop-down menu, choose a USD light type, for example, UsdLuxRectLight.

   The full light material parameters open and you can make adjustments.

5. In the Viewer tab, click View > Lighting using USD Lights to enable the USD lights.
6. Position the light using the Transform, Rotate, Scale, and Center of Interest manipulators in the Hydra Viewer.