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For instance, all the light nodes in Arnold have parameters called "color" and "intensity".
So, you simple simply have to set two attributes called ArnoldLightColor and ArnoldLightIntensity, and they will be automatically pushed as the value of the corresponding parameters of the Arnold lights. There is no need to do anything in the light rendertree.

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Note that, not being pulled by any rendertree node, you must force ICE to export the ArnoldLIght* attributes, for instance by displaying their values in the viewport, as showing below.
Another (better) method is to make the ICE attributes pass through a Log Value. This seem seems to work also when the the Log flag is disabled.

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