The Huntington 18" ceiling mount has an open roof design and a matching glass bottom panel. It is also available in a smaller 14" version.
HCM-18 (Huntington 18" ceiling mount)
Shown in WO (white opalescent glass)
and AB (antique brass metal finish)
Fixture width: 18"
Fixture height: 18"
Overall height: 41-3/4"
Back plate/Canopy/Base: 10" sq.
Lamping Requirements: 2-100W
C-UL Rating: Incand. Dry