Osram HQA 80W High pressure mercury lamp

These lamps were originally used for highway and street lighting, both in the States and Europe, but they are now used mostly for back door porch security lighting in the United States. In Europe they have been mostly decommissioned and have been replaced with more efficient lamps.

Info and spectum data based on http://ioannis.virtualcomposer2000.com/spectroscope/amici.html