This listing is for a pair of T-12 fluorescent waterproof end caps, an Ice Cap 660 wiring harness, and other accessories. These items can be used for general lighting in a marine water or freshwater fish tank. The bulb type is T12. The features of these items include high intensity lighting and they are suitable for a non-domestic environment. If you are looking for quality lighting and accessories for your aquarium, this bundle is a great option.