Am I able to add feature like lights to etc argument3d offline? If I can, how?

no, there currently isn't. you're limited to what the library already has.

I have the usb which allowed me to connect to the color source light. Am I be able to to it now?

maybe i misunderstood. i thought you want to import a 3D model of a fixture from sketchup into Augment3d and then use it as a working light in Augment3d.

but maybe you're asking to just add a light from the library for Augment3d to simulate a stage?

or are you looking to control a real life fixture?