Styles like these could be appropriate. Not going to be able to purchase one at your local box store. This will be a special order item.

https://www.kichler.com/products/outdoor-lighting/outdoor-hanging-lights/

https://www.lumens.com/tube-architectural-pendant-by-wac-lighting-WACP164889.html#cgid=%0A%09%0A%09%0935%0A%09%0A&prefn1=StandardFinish&prefv1=White&tileIndex=17

Try:

Troy Lighting: https://www.hvlgroup.com/Products/Exterior/Category/Hanging

Hinkley Lighting: https://www.hinkleylighting.com/family-representatives/outdoor-lighting/hanging.html

Visual Comfort also makes some larger scale outdoor pendants.

Anything real large will likely need to be custom.

Brands like Savoy House, Kichler, Hinkley and Troy Lighting might be of interest to you--they have lots of stylish outdoor lights!

Thank you. The largest fixtures these companies have is 25"..I need much larger.

Are you sure you need a large light? The pendant on the White House is about 36" in diameter. If you home as large as the white house?