Did you? I was wondering what it was supposed to do. Finally I figured it out - the color of the bulb represents what Molecular Reconstruction mode you are in. Depending on the mode, it shines in a different color.
I don't know what that means in-universe for what the bulb itself does or represent, but at least it has a visual purpose.
I don't know what that means in-universe for what the bulb itself does or represent, but at least it has a visual purpose.