The best replacement for mercury vapor is metal halide.

The best alternatives to mercury vapor are rated as following:
★★★★★  metal halide
★★★★★  high pressure sodium
★★  sodium
★  sodium vapor
★  hps
  sodium lighting
  multi vapor
  high pressure sodium bulbs
  sodium lights

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Google Trends

Scale is based on the average worldwide traffic of mercury vapor in all years. Click on graph for more.
mercury vapor
metal halide
high pressure sodium