How to create realistic moonlighting?

First of all, I want to state that I am very new to TF2 map-making. I only started making maps about 2 weeks ago (begging of summer-ish). The map I am currently working on is a koth map set at night time and I was wondering how to create light entities that make it look like the moon is casting light onto the map. As stated previously I am still very much a beginner and have no right to call myself a 'mapper' or anything like that at the moment. I'm only doing this as TF2 is one of my favourite games and I want to make something fun for me and my friends to enjoy.

I have watched all of ueak crash's videos including this one on lighting basics I am using the same skybox sed in double cross. The question was more about how to create soft blue-ish light entities that make it look like they're lighting up the map

thank you for responding!