The best replacement for high pressure sodium is metal halide.

The best alternatives to high pressure sodium are rated as following:
★★★★★  metal halide
★★★  mercury vapor
★★★  fluorescent
★★  low pressure sodium
★  led grow lights
★  incandescent
★  metal halide lighting
★  metal halide grow lights
  metal halide lights
  led street lights
  induction lighting
  halide
  metal halide lamps
  mercury vapor lights
  metal hydride
  pulse start metal halide
  metal halide grow light

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Speaking about high pressure sodium, one probably shouldn't forget about metal halide ballast.

Other search terms related to high pressure sodium and their ratings are:
★★★★★ metal halide ballast
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high pressure sodium
metal halide
mercury vapor