YAL Lightmapper question

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Hey guys, I'm using the YAL Lightmapper by Marcelo. I notice the default settings for the point light renders the light with 100% of their intensity all the way to the light range leaving a bright circle edge on the light map. I'd like the intensity to fall off as it gets to the max range of the light. It looks light there are some parameters to control this in the CreateLMLight function, called "att", I'm assuming this is attenuation, but there is no description of how it works. Any ideas?