In my current WIP I have a room with lights at the window to make it look like the outside light is comng in. is it possible to make them turn off at night or even dim as the day progresses before going out?

Yes, you need to add a script that will enable or disable the lights depending on the time of day. Like the existing script, Streetlights.

You cannot dim them, you would have to have different lights with different brightnesses and enable/disable the right ones. This is a little more complex.

I am a massive noob at scripting. The streetlightscript says ''if gamehour >= 18|| gamehour < 7'' do I change both of those numbers or just one? remember I need the lights to turn off at night not on. or can i just change the ''endable else disable'' to ''disable else enable?

You could just switch the enable and disable around the other way. Just don't change that script, copy it, give it a new name, and your good to go.

I would suggest taking a look at the All Natural Real Lights plugin as they do exactly that in there on many occasions. You might even be able to use their script, too (but do ask for permission first!).