Which Dome light for exo terra 12x12x18?

[Tokayy]

I was wondering who made a small enough dome light that would fit sitting on the top of the mesh of the exo terra 12x12x18? I know the 5.5 inch dome lights that are made are too big and was wondering who made the next size down and what that is. So far I have not been able to find such a thing and would have thought exo terra would make one, but I didn't see one on their website.

 

[Riverside Reptiles]

I'd go to Home Depot and get one there. They tend to be a good bit cheaper and more heavy duty.