Lightmapping Issue

Hello all, I am new to lightmaps and have been reading as much as I can about it, but I have an issue. I am using a single point light, and I like how it looks in the scene. However, the map I get from it looks terrible. I get banding and artifacting and it just looks bad.

My hope is that someone has seen this before and knows what "setting" I need to fix so I get the lightmap to look like the scene.

Thanks, Justin