I am working with a simple model of a fluorescent light, but I can't understand how the material works. I want to be able to change the color of the casing and also color of the light glow. The trouble is it all seems to be one material and I'm not sure how this was done.
Usually I see most things would be designed with say two materials (one for the case, and one for the light) and the materials would each be applied to the relevant faces. But here the whole thing is one material so I don't get how that works or how I edit each section's color/parameters.
Here are screencaps:
Here is the file:
How specifically would I change the color of the casing or the bulb?
Thanks for any help.