High-pressure mercury lamps combine high luminous output and long lamp life with small size. In view of their poor color rendition properties and long starting time, they are employed mainly for industrial plant and outdoor locations. High-pressure mercury lamps are operated with a ballast. Additional ignition gear is not required.


  • Good luminous output (32-60 lm/W)
  • No igniter required
  • Wide range of wattage
  • Long lamp life (10,000-12,000 h)
  • Small size


  • Poor color rendition
  • Long starting and restriking times (approx. 5 min.)
  • High price