Led illuminating device and light engine thereof

An LED illuminating device, comprising:

• an optical section being provided with a light source therein;
• an electrical section being electrically connected with the light source;
• and
• a heat dissipation section located between the optical section and the electrical section, the heat dissipation section being provided with a heat sink and at least one heat pipe therein, the heat sink comprising a metal tube, a plurality of metal fins extending radially and outwardly from an outer circumferential surface of the metal tube, and a heat-absorbing plate attached to a bottom of the metal tube, a top of the metal tube being open and facing the electrical section, a chamber being axially defined in the metal tube and extending from the top to the bottom of the metal tube, the at least one heat pipe comprising an evaporating section and a condensing section, the at least one heat pipe being received in the chamber of the metal tube, the evaporating section of the at least one heat pipe being attached to an inner surface of the heat-absorbing plate, the condensing section of the at least one heat pipe being attached to an inner circumferential surface of the metal tube, the light source being attached to an outer surface of the heat-absorbing plate.