The invention discloses an HED (High Efficiency Discharge) lamp with a built-in single-electrode ultraviolet discharge tube in a lamp bulb. In the HED lamp bulb, two electric arc tubes are connected in parallel; the two ends of each electric arm tube are electrically connected with two lamp bulb terminals of the HED lamp respectively; two ultraviolet discharge tubes are arranged between the two electric-arc tubes; the two lamp bulb terminals are electrically connected with one terminal electrode of one ultraviolet discharge tube respectively; the other terminal electrode of each ultraviolet discharge tube is suspended. The HED lamp is easy for starting, is safe and reliable, has long service life, and is low in cost.