Mantra: deactivate a light after its contribution is lower than a certain threshold

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Currently working on a scene with a very large number of lights, and I'm noticing a huge impact on render time when I limit the active radius of the lights to a value where their contribution is negligible. I'm wondering if there is a way to do this automatically in Mantra, or if I'd be better off doing an expression on the lights based on their exposure.
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