These incandescent hoods can be used on most brands of aquariums. They fit on the lip of the aquarium frame for a nice, finished look. The Economy 16" and 20" hoods feature a one piece design with lexan bulb splash shields for longer bulb life. 16" and 20" Deluxe Incandescent Full Hoods feature full length door and convenient rear cut-out sections for popular accessories. All hoods are the latest design and are U.L. listed. Bulbs are not included.