If you need a dome light in a hurry, Home Depot sells them as well. They are overkill, but can be used with a lower wattage bulb.
https://www.homedepot.com/p/HDX-150-...0PDQ/205031467
https://www.homedepot.com/p/HDX-75-W...0PDQ/205139241
That assumes, the have CHE at your local pet store.
And, as Sauzo said, definitely use a dimmer (also sold at home depot).