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In the Katana Preferences, make sure that the 3Delight Render View preference is is to either 3Delight Display or Both.

This will ensure that 3Delight Display is launched upon rendering. We are going to use its Mixer feature a bit later.

In the Node Graph, double-click DlSettings to display its parameters.

Expand Image Layers, then Multi-Light. In the light list,select the light layers to be rendered.

Right-click the DlSettings node in the Node Graph and select Start a Preview Render by pressing Control + P or by right-clicking the Render node and choosing Preview Render. 

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3Delight Display will open and show the rendering as it progresses.

Preview renders can also be launched by selecting Render → Preview Render View Node from Katana's main menu.

In 3Delight Display, display the contact sheet by double-clicking the layers icon in the Thumbnail Viewimage or its thumbnail.

The Contact Sheet can also be displayed by choosing View → Contact Sheet.

All rendered layers are shown. You can see one layer per entry picked in the Multi-light list, in addition to the primary RGBA layer. Pick any layer Click on a layer in the contact sheet to display it in full size by clicking on it. You can also use the page up and page down keys to cycle through the layers.  

Select the primary RGBA layer to continue.

In Katana double-click on the GafferThree node to edit its parameters. In the GafferThree parameters unfold the rig node to display all three lights in the scene. Note their current Note the current light intensity values.

Back in 3Delight Display, open the preferences by choosing File → Preferences...

In the Preferences window, pick the General tab. Make sure the Enable interactive adjustments of lights in the scene is enabled.

Close the Preferences dialog.

Bring up the Mixer by choosing Edit → Mixer...

The Mixer displays a list of lights that matches the selected entries in the Multi-LIght list of the rendering attributes.

• Clicking on the solo gadget of a given light or rig will change the rendered image to show only that light's contribution to the rendering. At most one Mixer item can set as solo.
• Clicking the check box gadget will toggle that light or light rig contribution to the rendered image on or off.
• The Luminosity slider acts as an exposure on the light or light rig contribution to the rendered image.
• The colour picker acts as a multiplier to the light source or light rig colour.

Drag one of the Luminosity sliders; you will see the rendered image in 3Delight Display will conform to the modified intensity.

The intensity values of the light(s) in KATANA will change accordingly.