There are three senate office buildings in Washington, DC that house the offices of the senators. Hart has those strobes mounted alone, one has the horn and strobe mounted on a wall, and one has the horn and strobe mounted on the ceiling.
The Edgewater Hotel in Gatlinburg, TN has those horns with Federal Signal wedge I strobes. This was the same hotel whose main alarms were full size rudland speakers with the i strobes.