The best replacement for 20k is 14k metal halide.

The best alternatives to 20k are rated as following:
★★★★★  14k metal halide
★★★★  ai9
★★★★  ribcor
★★★  14k
★★  nxg
★★  11k skates
★  radium
★  bauer apx
★  ccm rbz
★  20m
★  11k
  total one nxg
  phoenix 14k
  20k

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20k
14k metal halide
ai9