LED lamp 10 includes a housing, a mounting base, a light engine (LE) 16, light-transmissive cover 20 circumscribing the LE, and reflector 18. The LE comprises a plurality of top-emitting LED packages (TE-LED packages) mounted on planar upper surface 32 of PC board 26, each configured to emit light having an angular distribution centered around a principal light-emitting direction (PLED) normal to an emission face 45. A first set 36 of TE-LEDs is mounted with its PLED perpendicular to PCB 26 and a second set 38 of TE-LEDs is mounted to the PCB with its PLED orthogonal to that of the first set 36 of TE-LEDs and parallel to upper surface 32. Reflector 18 disposed below LE 16 reflects light towards cover 20. A polar light distribution of light emitted from LED lamp 10 is omnidirectional and is Energy Star compliant.