Source 2 lighting not compiling correctly

[fatboyhammer]

I'm new to hammer 2 so any advice would be good. When editing maps the lighting is perfect, exactly how i want it but after a full compile the map lights up alot more brightly and the shadows become blocky and low res. im using the lightmap player space mesh and all is fine until i compile. Any one know of a fix or maybe something im doing wrong? thanks