When unloading a board from the inside of my grand prix I ended up poking the end of it into the door courtesy lens on the inside door panel and broke the (red) lens.

I just now got around to ordering a replacement online and it arrives today.

MY question though perhaps silly is... is there an actually bulb behind the lens or is it just a lens cover for reflecting light, like a reflector on a bicycle?

Also do I have to take off the door panel to mount the new lens?

Thanks
Terry