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Mercury Vapor Ballast

See Metal Halide Ballast Section.
Mercury Vapor ballasts have now been discontinued,
and are no longer available.
Some Metal Halide ballasts will also operate the equal
Mercury Vapor lamp - 175w, 250w, 400w and 1000w.
It is best to replace Mercury Vapor lamps with a lower
wattage metal halide lamp/ballast, as Metal Halide is
about 25% brighter than Mercury Vapor. 
Because the lower wattage Metal Halide Ballasts are
Pulse-Start, they cannot be used with Mercury Vapor
Please call if you have any questions on this.