Quote: "My game is set indoors on a bright day. What is the best ambient light level (with red, green and blue as well) and what light colour should I use for my windows which would also be projecting light?"
I prefer to use 7 for ambience and for light colour I use brown white,here hex code for your light "9a9a9a" (Paste it in Light Color of your light marker)
Quote: "One more thing, my dynamic lights are odd, they tend to flicker on and off when I move around, how do I fix that and should I use static or dynamic lighting for windows like this?"
I suggest you to use static light for this.
That's all I can help you

.
MY ENGLISH IS NOT GOOD LIKE YOURS.