Vintage Faux Wood Metal Aquarium Fish Tank Light Fixture 15” Working!  Comes with 40 watt reptile bulb - daylight Neodymium white.
You can use this for your fish tank just put a fish tank light in the fixture.  If you have a terrarium this light is perfect for your reptiles.  
You have to loosen the fixture bolt to install the bulb that come with this light fixture.  The correct bulb for the fixture is about 6 inches long and thin.  They sell at all pet store.
 

 Vintage metal aquarium fish tank light fixture is a must-have for aquarium enthusiasts. With its 15" width, it provides adequate lighting for your aquatic creatures and also comes with a reptile light to add to the ambiance. The fixture falls under the "Fixture" type and is listed in the "Lighting & Bulbs," "Fish & Aquariums," and "Pet Supplies" categories. It is made of high-quality metal and has a unique vintage design that will add a touch of style to any aquarium. Enjoy the beauty and functionality of this one-of-a-kind light fixture.