Mercury Vapor Self-Ballasted
Self-ballasted Mercury Vapor lamps combine the lamp and ballast into a single unit, eliminating the need for an external ballast. These lamps are easier to install and use in standard screw-in sockets. They provide a bluish-white light and are commonly used for outdoor or security lighting. However, like traditional mercury vapor lamps, they have low color rendering and are being phased out in favor of more efficient lighting technologies.